diff --git a/01-simple-application/web-application/composer.json b/01-simple-application/web-application/composer.json
index 29c447e..76ce994 100644
--- a/01-simple-application/web-application/composer.json
+++ b/01-simple-application/web-application/composer.json
@@ -9,7 +9,7 @@
     ],
     "require": {
         "slim/slim": "4.8.0",
-        "guzzlehttp/guzzle": "7.2.0",
+        "guzzlehttp/guzzle": "7.3.0",
         "guzzlehttp/psr7": "1.8.1",
         "http-interop/http-factory-guzzle": "1.2.0"
     }
diff --git a/01-simple-application/web-application/composer.lock b/01-simple-application/web-application/composer.lock
index b9ee465..bbc8d86 100644
--- a/01-simple-application/web-application/composer.lock
+++ b/01-simple-application/web-application/composer.lock
@@ -4,26 +4,26 @@
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-    "content-hash": "760dd1202bf02d110f0c75c496eb2940",
+    "content-hash": "b96125d938ff09ba0f44c6bec05760c7",
     "packages": [
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             "name": "guzzlehttp/guzzle",
-            "version": "7.2.0",
+            "version": "7.3.0",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
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-                "reference": "0aa74dfb41ae110835923ef10a9d803a22d50e79",
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+                "reference": "7008573787b430c1c1f650e3722d9bba59967628",
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                 "guzzlehttp/promises": "^1.4",
-                "guzzlehttp/psr7": "^1.7",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
                 "php": "^7.2.5 || ^8.0",
                 "psr/http-client": "^1.0"
             },
@@ -31,6 +31,7 @@
                 "psr/http-client-implementation": "1.0"
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+                "bamarni/composer-bin-plugin": "^1.4.1",
                 "ext-curl": "*",
                 "php-http/client-integration-tests": "^3.0",
                 "phpunit/phpunit": "^8.5.5 || ^9.3.5",
@@ -44,7 +45,7 @@
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-                    "dev-master": "7.1-dev"
+                    "dev-master": "7.3-dev"
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@@ -86,7 +87,7 @@
             ],
             "support": {
                 "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/7.2.0"
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
             },
             "funding": [
                 {
@@ -106,7 +107,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2020-10-10T11:47:56+00:00"
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
diff --git a/05-configmaps-and-secrets/web-application/composer.json b/05-configmaps-and-secrets/web-application/composer.json
index c5cf6eb..051856d 100644
--- a/05-configmaps-and-secrets/web-application/composer.json
+++ b/05-configmaps-and-secrets/web-application/composer.json
@@ -9,6 +9,6 @@
     ],
     "require": {
         "slim/slim": "4.8.0",
-        "guzzlehttp/guzzle": "6.5.5"
+        "guzzlehttp/guzzle": "7.3.0"
     }
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diff --git a/05-configmaps-and-secrets/web-application/composer.lock b/05-configmaps-and-secrets/web-application/composer.lock
index 766d555..3a8b1a2 100644
--- a/05-configmaps-and-secrets/web-application/composer.lock
+++ b/05-configmaps-and-secrets/web-application/composer.lock
@@ -4,41 +4,48 @@
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-    "content-hash": "a63d867f510063bf83841b66e9ba1865",
+    "content-hash": "6d4bbe2fc21d9c8d1fcf94cc30b0645a",
     "packages": [
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             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.3.0",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
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-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
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-                "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
+                "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.5-dev"
+                    "dev-master": "7.3-dev"
                 }
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@@ -58,6 +65,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,30 +80,54 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "v1.3.1",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d"
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             "dist": {
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-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/8e7d04f1f6450fef59366c399cfad4b9383aa30d",
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5.0"
+                "php": ">=5.5"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.0"
+                "symfony/phpunit-bridge": "^4.4 || ^5.1"
             },
             "type": "library",
             "extra": {
@@ -122,50 +158,54 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2016-12-20T10:07:11+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.4.1"
+            },
+            "time": "2021-03-07T09:25:29+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.6.1",
+            "version": "2.0.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7"
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                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/psr7/zipball/239400de7a173fe9901b9ac7c06497751f00727a",
-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
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-                "php": ">=5.4.0",
-                "psr/http-message": "~1.0",
-                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-factory": "^1.0",
+                "psr/http-message": "^1.0",
+                "ralouphie/getallheaders": "^3.0"
             },
             "provide": {
+                "psr/http-factory-implementation": "1.0",
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "ext-zlib": "*",
-                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "http-interop/http-factory-tests": "^0.9",
+                "phpunit/phpunit": "^8.5.8 || ^9.3.10"
             },
             "suggest": {
-                "zendframework/zend-httphandlerrunner": "Emit PSR-7 responses"
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6-dev"
+                    "dev-master": "2.0-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
                     "GuzzleHttp\\Psr7\\": "src/"
-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -180,6 +220,11 @@
                 {
                     "name": "Tobias Schultze",
                     "homepage": "https://github.com/Tobion"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "PSR-7 message implementation that also provides common utility methods",
@@ -193,7 +238,11 @@
                 "uri",
                 "url"
             ],
-            "time": "2019-07-01T23:21:34+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/2.0.0"
+            },
+            "time": "2021-06-30T20:03:07+00:00"
         },
         {
             "name": "nikic/fast-route",
@@ -246,76 +295,85 @@
             "time": "2018-02-13T20:26:39+00:00"
         },
         {
-            "name": "paragonie/random_compat",
-            "version": "v9.99.99",
+            "name": "psr/container",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
+                "url": "https://github.com/php-fig/container.git",
+                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef"
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-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/2ae37329ee82f91efadc282cc2d527fd6065a5ef",
+                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef",
                 "shasum": ""
             },
             "require": {
-                "php": "^7"
+                "php": ">=7.2.0"
             },
-            "require-dev": {
-                "phpunit/phpunit": "4.*|5.*",
-                "vimeo/psalm": "^1"
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
             },
-            "suggest": {
-                "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Container\\": "src/"
+                }
             },
-            "type": "library",
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
             "authors": [
                 {
-                    "name": "Paragon Initiative Enterprises",
-                    "email": "security@paragonie.com",
-                    "homepage": "https://paragonie.com"
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
                 }
             ],
-            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
             "keywords": [
-                "csprng",
-                "polyfill",
-                "pseudorandom",
-                "random"
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
             ],
-            "time": "2018-07-02T15:55:56+00:00"
+            "support": {
+                "issues": "https://github.com/php-fig/container/issues",
+                "source": "https://github.com/php-fig/container/tree/2.0.1"
+            },
+            "time": "2021-03-24T13:40:57+00:00"
         },
         {
-            "name": "psr/container",
-            "version": "2.0.1",
+            "name": "psr/http-client",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/container.git",
-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef"
+                "url": "https://github.com/php-fig/http-client.git",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/container/zipball/2ae37329ee82f91efadc282cc2d527fd6065a5ef",
-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef",
+                "url": "https://api.github.com/repos/php-fig/http-client/zipball/2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.0"
+                "php": "^7.0 || ^8.0",
+                "psr/http-message": "^1.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "1.0.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Container\\": "src/"
+                    "Psr\\Http\\Client\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -325,23 +383,21 @@
             "authors": [
                 {
                     "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
+                    "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
+            "description": "Common interface for HTTP clients",
+            "homepage": "https://github.com/php-fig/http-client",
             "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
+                "http",
+                "http-client",
+                "psr",
+                "psr-18"
             ],
             "support": {
-                "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/2.0.1"
+                "source": "https://github.com/php-fig/http-client/tree/master"
             },
-            "time": "2021-03-24T13:40:57+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
             "name": "psr/http-factory",
@@ -653,6 +709,10 @@
                 }
             ],
             "description": "A polyfill for getallheaders.",
+            "support": {
+                "issues": "https://github.com/ralouphie/getallheaders/issues",
+                "source": "https://github.com/ralouphie/getallheaders/tree/develop"
+            },
             "time": "2019-03-08T08:55:37+00:00"
         },
         {
@@ -768,322 +828,6 @@
                 }
             ],
             "time": "2021-04-29T03:43:44+00:00"
-        },
-        {
-            "name": "symfony/polyfill-intl-idn",
-            "version": "v1.18.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/symfony/polyfill-intl-idn.git",
-                "reference": "5dcab1bc7146cf8c1beaa4502a3d9be344334251"
-            },
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-                "url": "https://api.github.com/repos/symfony/polyfill-intl-idn/zipball/5dcab1bc7146cf8c1beaa4502a3d9be344334251",
-                "reference": "5dcab1bc7146cf8c1beaa4502a3d9be344334251",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.3.3",
-                "symfony/polyfill-intl-normalizer": "^1.10",
-                "symfony/polyfill-php70": "^1.10",
-                "symfony/polyfill-php72": "^1.10"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.18-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Laurent Bassin",
-                    "email": "laurent@bassin.info"
-                },
-                {
-                    "name": "Trevor Rowbotham",
-                    "email": "trevor.rowbotham@pm.me"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "idn",
-                "intl",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-08-04T06:02:08+00:00"
-        },
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-            "homepage": "https://symfony.com",
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-                    "type": "tidelift"
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-            ],
-            "time": "2020-07-14T12:35:20+00:00"
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     ],
     "packages-dev": [],
@@ -1094,5 +838,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/12-excercise/excercise-app/composer.json b/12-excercise/excercise-app/composer.json
index c5cf6eb..051856d 100644
--- a/12-excercise/excercise-app/composer.json
+++ b/12-excercise/excercise-app/composer.json
@@ -9,6 +9,6 @@
     ],
     "require": {
         "slim/slim": "4.8.0",
-        "guzzlehttp/guzzle": "6.5.5"
+        "guzzlehttp/guzzle": "7.3.0"
     }
 }
diff --git a/12-excercise/excercise-app/composer.lock b/12-excercise/excercise-app/composer.lock
index 766d555..3a8b1a2 100644
--- a/12-excercise/excercise-app/composer.lock
+++ b/12-excercise/excercise-app/composer.lock
@@ -4,41 +4,48 @@
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-    "content-hash": "a63d867f510063bf83841b66e9ba1865",
+    "content-hash": "6d4bbe2fc21d9c8d1fcf94cc30b0645a",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.3.0",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
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-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
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-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
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             },
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-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
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+                    "dev-master": "7.3-dev"
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@@ -58,6 +65,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
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+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,30 +80,54 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "v1.3.1",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d"
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-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/8e7d04f1f6450fef59366c399cfad4b9383aa30d",
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d",
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+                "php": ">=5.5"
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-                "phpunit/phpunit": "^4.0"
+                "symfony/phpunit-bridge": "^4.4 || ^5.1"
             },
             "type": "library",
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@@ -122,50 +158,54 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2016-12-20T10:07:11+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.4.1"
+            },
+            "time": "2021-03-07T09:25:29+00:00"
         },
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-            "version": "1.6.1",
+            "version": "2.0.0",
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                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7"
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-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
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-                "php": ">=5.4.0",
-                "psr/http-message": "~1.0",
-                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-factory": "^1.0",
+                "psr/http-message": "^1.0",
+                "ralouphie/getallheaders": "^3.0"
             },
             "provide": {
+                "psr/http-factory-implementation": "1.0",
                 "psr/http-message-implementation": "1.0"
             },
             "require-dev": {
-                "ext-zlib": "*",
-                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "http-interop/http-factory-tests": "^0.9",
+                "phpunit/phpunit": "^8.5.8 || ^9.3.10"
             },
             "suggest": {
-                "zendframework/zend-httphandlerrunner": "Emit PSR-7 responses"
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6-dev"
+                    "dev-master": "2.0-dev"
                 }
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             "autoload": {
                 "psr-4": {
                     "GuzzleHttp\\Psr7\\": "src/"
-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -180,6 +220,11 @@
                 {
                     "name": "Tobias Schultze",
                     "homepage": "https://github.com/Tobion"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "PSR-7 message implementation that also provides common utility methods",
@@ -193,7 +238,11 @@
                 "uri",
                 "url"
             ],
-            "time": "2019-07-01T23:21:34+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/2.0.0"
+            },
+            "time": "2021-06-30T20:03:07+00:00"
         },
         {
             "name": "nikic/fast-route",
@@ -246,76 +295,85 @@
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         },
         {
-            "name": "paragonie/random_compat",
-            "version": "v9.99.99",
+            "name": "psr/container",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
+                "url": "https://github.com/php-fig/container.git",
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-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
+                "url": "https://api.github.com/repos/php-fig/container/zipball/2ae37329ee82f91efadc282cc2d527fd6065a5ef",
+                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef",
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+                "php": ">=7.2.0"
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-            "require-dev": {
-                "phpunit/phpunit": "4.*|5.*",
-                "vimeo/psalm": "^1"
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
             },
-            "suggest": {
-                "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+            "autoload": {
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+                    "Psr\\Container\\": "src/"
+                }
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-            "type": "library",
             "notification-url": "https://packagist.org/downloads/",
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             ],
             "authors": [
                 {
-                    "name": "Paragon Initiative Enterprises",
-                    "email": "security@paragonie.com",
-                    "homepage": "https://paragonie.com"
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
                 }
             ],
-            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
             "keywords": [
-                "csprng",
-                "polyfill",
-                "pseudorandom",
-                "random"
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
             ],
-            "time": "2018-07-02T15:55:56+00:00"
+            "support": {
+                "issues": "https://github.com/php-fig/container/issues",
+                "source": "https://github.com/php-fig/container/tree/2.0.1"
+            },
+            "time": "2021-03-24T13:40:57+00:00"
         },
         {
-            "name": "psr/container",
-            "version": "2.0.1",
+            "name": "psr/http-client",
+            "version": "1.0.1",
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-                "url": "https://github.com/php-fig/container.git",
-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef"
+                "url": "https://github.com/php-fig/http-client.git",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621"
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-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef",
+                "url": "https://api.github.com/repos/php-fig/http-client/zipball/2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.0"
+                "php": "^7.0 || ^8.0",
+                "psr/http-message": "^1.0"
             },
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             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "1.0.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Container\\": "src/"
+                    "Psr\\Http\\Client\\": "src/"
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             },
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@@ -325,23 +383,21 @@
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                     "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
+                    "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
+            "description": "Common interface for HTTP clients",
+            "homepage": "https://github.com/php-fig/http-client",
             "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
+                "http",
+                "http-client",
+                "psr",
+                "psr-18"
             ],
             "support": {
-                "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/2.0.1"
+                "source": "https://github.com/php-fig/http-client/tree/master"
             },
-            "time": "2021-03-24T13:40:57+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
             "name": "psr/http-factory",
@@ -653,6 +709,10 @@
                 }
             ],
             "description": "A polyfill for getallheaders.",
+            "support": {
+                "issues": "https://github.com/ralouphie/getallheaders/issues",
+                "source": "https://github.com/ralouphie/getallheaders/tree/develop"
+            },
             "time": "2019-03-08T08:55:37+00:00"
         },
         {
@@ -768,322 +828,6 @@
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-            "suggest": {
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-            },
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-                }
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-            "autoload": {
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-                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
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-                    "email": "trevor.rowbotham@pm.me"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
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-            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
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-                "intl",
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-            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
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-                "shim"
-            ],
-            "funding": [
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-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
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-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-07-14T12:35:20+00:00"
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     ],
     "packages-dev": [],
@@ -1094,5 +838,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/14-connecting-to-the-database/web-application/composer.json b/14-connecting-to-the-database/web-application/composer.json
index c5cf6eb..051856d 100644
--- a/14-connecting-to-the-database/web-application/composer.json
+++ b/14-connecting-to-the-database/web-application/composer.json
@@ -9,6 +9,6 @@
     ],
     "require": {
         "slim/slim": "4.8.0",
-        "guzzlehttp/guzzle": "6.5.5"
+        "guzzlehttp/guzzle": "7.3.0"
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 }
diff --git a/14-connecting-to-the-database/web-application/composer.lock b/14-connecting-to-the-database/web-application/composer.lock
index 766d555..3a8b1a2 100644
--- a/14-connecting-to-the-database/web-application/composer.lock
+++ b/14-connecting-to-the-database/web-application/composer.lock
@@ -4,41 +4,48 @@
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-    "content-hash": "a63d867f510063bf83841b66e9ba1865",
+    "content-hash": "6d4bbe2fc21d9c8d1fcf94cc30b0645a",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.3.0",
             "source": {
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
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-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/7008573787b430c1c1f650e3722d9bba59967628",
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628",
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-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
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             },
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+                "bamarni/composer-bin-plugin": "^1.4.1",
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
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-                    "dev-master": "6.5-dev"
+                    "dev-master": "7.3-dev"
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@@ -58,6 +65,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
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+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,30 +80,54 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "v1.3.1",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d"
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-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/8e7d04f1f6450fef59366c399cfad4b9383aa30d",
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d",
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             },
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-                "php": ">=5.5.0"
+                "php": ">=5.5"
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             "require-dev": {
-                "phpunit/phpunit": "^4.0"
+                "symfony/phpunit-bridge": "^4.4 || ^5.1"
             },
             "type": "library",
             "extra": {
@@ -122,50 +158,54 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2016-12-20T10:07:11+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.4.1"
+            },
+            "time": "2021-03-07T09:25:29+00:00"
         },
         {
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-            "version": "1.6.1",
+            "version": "2.0.0",
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                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7"
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-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a",
+                "url": "https://api.github.com/repos/guzzle/psr7/zipball/1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7",
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-                "php": ">=5.4.0",
-                "psr/http-message": "~1.0",
-                "ralouphie/getallheaders": "^2.0.5 || ^3.0.0"
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-factory": "^1.0",
+                "psr/http-message": "^1.0",
+                "ralouphie/getallheaders": "^3.0"
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             },
             "require-dev": {
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-                "phpunit/phpunit": "~4.8.36 || ^5.7.27 || ^6.5.8"
+                "bamarni/composer-bin-plugin": "^1.4.1",
+                "http-interop/http-factory-tests": "^0.9",
+                "phpunit/phpunit": "^8.5.8 || ^9.3.10"
             },
             "suggest": {
-                "zendframework/zend-httphandlerrunner": "Emit PSR-7 responses"
+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6-dev"
+                    "dev-master": "2.0-dev"
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             "autoload": {
                 "psr-4": {
                     "GuzzleHttp\\Psr7\\": "src/"
-                },
-                "files": [
-                    "src/functions_include.php"
-                ]
+                }
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -180,6 +220,11 @@
                 {
                     "name": "Tobias Schultze",
                     "homepage": "https://github.com/Tobion"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "PSR-7 message implementation that also provides common utility methods",
@@ -193,7 +238,11 @@
                 "uri",
                 "url"
             ],
-            "time": "2019-07-01T23:21:34+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/2.0.0"
+            },
+            "time": "2021-06-30T20:03:07+00:00"
         },
         {
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@@ -246,76 +295,85 @@
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         },
         {
-            "name": "paragonie/random_compat",
-            "version": "v9.99.99",
+            "name": "psr/container",
+            "version": "2.0.1",
             "source": {
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-                "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
+                "url": "https://github.com/php-fig/container.git",
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-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
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+                "php": ">=7.2.0"
             },
-            "require-dev": {
-                "phpunit/phpunit": "4.*|5.*",
-                "vimeo/psalm": "^1"
+            "type": "library",
+            "extra": {
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+                    "dev-master": "2.0.x-dev"
+                }
             },
-            "suggest": {
-                "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
+            "autoload": {
+                "psr-4": {
+                    "Psr\\Container\\": "src/"
+                }
             },
-            "type": "library",
             "notification-url": "https://packagist.org/downloads/",
             "license": [
                 "MIT"
             ],
             "authors": [
                 {
-                    "name": "Paragon Initiative Enterprises",
-                    "email": "security@paragonie.com",
-                    "homepage": "https://paragonie.com"
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
                 }
             ],
-            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
             "keywords": [
-                "csprng",
-                "polyfill",
-                "pseudorandom",
-                "random"
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
             ],
-            "time": "2018-07-02T15:55:56+00:00"
+            "support": {
+                "issues": "https://github.com/php-fig/container/issues",
+                "source": "https://github.com/php-fig/container/tree/2.0.1"
+            },
+            "time": "2021-03-24T13:40:57+00:00"
         },
         {
-            "name": "psr/container",
-            "version": "2.0.1",
+            "name": "psr/http-client",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
-                "url": "https://github.com/php-fig/container.git",
-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef"
+                "url": "https://github.com/php-fig/http-client.git",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621"
             },
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-                "reference": "2ae37329ee82f91efadc282cc2d527fd6065a5ef",
+                "url": "https://api.github.com/repos/php-fig/http-client/zipball/2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
+                "reference": "2dfb5f6c5eff0e91e20e913f8c5452ed95b86621",
                 "shasum": ""
             },
             "require": {
-                "php": ">=7.2.0"
+                "php": "^7.0 || ^8.0",
+                "psr/http-message": "^1.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "1.0.x-dev"
                 }
             },
             "autoload": {
                 "psr-4": {
-                    "Psr\\Container\\": "src/"
+                    "Psr\\Http\\Client\\": "src/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -325,23 +383,21 @@
             "authors": [
                 {
                     "name": "PHP-FIG",
-                    "homepage": "https://www.php-fig.org/"
+                    "homepage": "http://www.php-fig.org/"
                 }
             ],
-            "description": "Common Container Interface (PHP FIG PSR-11)",
-            "homepage": "https://github.com/php-fig/container",
+            "description": "Common interface for HTTP clients",
+            "homepage": "https://github.com/php-fig/http-client",
             "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
+                "http",
+                "http-client",
+                "psr",
+                "psr-18"
             ],
             "support": {
-                "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/2.0.1"
+                "source": "https://github.com/php-fig/http-client/tree/master"
             },
-            "time": "2021-03-24T13:40:57+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
             "name": "psr/http-factory",
@@ -653,6 +709,10 @@
                 }
             ],
             "description": "A polyfill for getallheaders.",
+            "support": {
+                "issues": "https://github.com/ralouphie/getallheaders/issues",
+                "source": "https://github.com/ralouphie/getallheaders/tree/develop"
+            },
             "time": "2019-03-08T08:55:37+00:00"
         },
         {
@@ -768,322 +828,6 @@
                 }
             ],
             "time": "2021-04-29T03:43:44+00:00"
-        },
-        {
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-            "source": {
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-                "url": "https://github.com/symfony/polyfill-intl-idn.git",
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-            },
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-                "symfony/polyfill-intl-normalizer": "^1.10",
-                "symfony/polyfill-php70": "^1.10",
-                "symfony/polyfill-php72": "^1.10"
-            },
-            "suggest": {
-                "ext-intl": "For best performance"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.18-dev"
-                },
-                "thanks": {
-                    "name": "symfony/polyfill",
-                    "url": "https://github.com/symfony/polyfill"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Symfony\\Polyfill\\Intl\\Idn\\": ""
-                },
-                "files": [
-                    "bootstrap.php"
-                ]
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Laurent Bassin",
-                    "email": "laurent@bassin.info"
-                },
-                {
-                    "name": "Trevor Rowbotham",
-                    "email": "trevor.rowbotham@pm.me"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill for intl's idn_to_ascii and idn_to_utf8 functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "idn",
-                "intl",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "funding": [
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-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
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-                    "type": "github"
-                },
-                {
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-            ],
-            "time": "2020-08-04T06:02:08+00:00"
-        },
-        {
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-            "version": "v1.18.1",
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-                "url": "https://github.com/symfony/polyfill-intl-normalizer.git",
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-                },
-                {
-                    "name": "Symfony Community",
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-                }
-            ],
-            "description": "Symfony polyfill for intl's Normalizer class and related functions",
-            "homepage": "https://symfony.com",
-            "keywords": [
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-            "autoload": {
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-                    "Symfony\\Polyfill\\Php70\\": ""
-                },
-                "files": [
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-                ],
-                "classmap": [
-                    "Resources/stubs"
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-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
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-            "authors": [
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-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
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-            "description": "Symfony polyfill backporting some PHP 7.0+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
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-                "shim"
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-            "funding": [
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-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
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-                    "type": "github"
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-        },
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-            "version": "v1.18.1",
-            "source": {
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-                "url": "https://github.com/symfony/polyfill-php72.git",
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-            "autoload": {
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-                },
-                "files": [
-                    "bootstrap.php"
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-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
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-            "authors": [
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-                    "name": "Nicolas Grekas",
-                    "email": "p@tchwork.com"
-                },
-                {
-                    "name": "Symfony Community",
-                    "homepage": "https://symfony.com/contributors"
-                }
-            ],
-            "description": "Symfony polyfill backporting some PHP 7.2+ features to lower PHP versions",
-            "homepage": "https://symfony.com",
-            "keywords": [
-                "compatibility",
-                "polyfill",
-                "portable",
-                "shim"
-            ],
-            "funding": [
-                {
-                    "url": "https://symfony.com/sponsor",
-                    "type": "custom"
-                },
-                {
-                    "url": "https://github.com/fabpot",
-                    "type": "github"
-                },
-                {
-                    "url": "https://tidelift.com/funding/github/packagist/symfony/symfony",
-                    "type": "tidelift"
-                }
-            ],
-            "time": "2020-07-14T12:35:20+00:00"
         }
     ],
     "packages-dev": [],
@@ -1094,5 +838,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/16-service-discovery/web-application/composer.json b/16-service-discovery/web-application/composer.json
index c5cf6eb..051856d 100644
--- a/16-service-discovery/web-application/composer.json
+++ b/16-service-discovery/web-application/composer.json
@@ -9,6 +9,6 @@
     ],
     "require": {
         "slim/slim": "4.8.0",
-        "guzzlehttp/guzzle": "6.5.5"
+        "guzzlehttp/guzzle": "7.3.0"
     }
 }
diff --git a/16-service-discovery/web-application/composer.lock b/16-service-discovery/web-application/composer.lock
index 766d555..3a8b1a2 100644
--- a/16-service-discovery/web-application/composer.lock
+++ b/16-service-discovery/web-application/composer.lock
@@ -4,41 +4,48 @@
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         "This file is @generated automatically"
     ],
-    "content-hash": "a63d867f510063bf83841b66e9ba1865",
+    "content-hash": "6d4bbe2fc21d9c8d1fcf94cc30b0645a",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
-            "version": "6.5.5",
+            "version": "7.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e"
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628"
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             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
-                "reference": "9d4290de1cfd701f38099ef7e183b64b4b7b0c5e",
+                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/7008573787b430c1c1f650e3722d9bba59967628",
+                "reference": "7008573787b430c1c1f650e3722d9bba59967628",
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             "require": {
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-                "guzzlehttp/promises": "^1.0",
-                "guzzlehttp/psr7": "^1.6.1",
-                "php": ">=5.5",
-                "symfony/polyfill-intl-idn": "^1.17.0"
+                "guzzlehttp/promises": "^1.4",
+                "guzzlehttp/psr7": "^1.7 || ^2.0",
+                "php": "^7.2.5 || ^8.0",
+                "psr/http-client": "^1.0"
+            },
+            "provide": {
+                "psr/http-client-implementation": "1.0"
             },
             "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.4.1",
                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
+                "php-http/client-integration-tests": "^3.0",
+                "phpunit/phpunit": "^8.5.5 || ^9.3.5",
                 "psr/log": "^1.1"
             },
             "suggest": {
+                "ext-curl": "Required for CURL handler support",
+                "ext-intl": "Required for Internationalized Domain Name (IDN) support",
                 "psr/log": "Required for using the Log middleware"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "6.5-dev"
+                    "dev-master": "7.3-dev"
                 }
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@@ -58,6 +65,11 @@
                     "name": "Michael Dowling",
                     "email": "mtdowling@gmail.com",
                     "homepage": "https://github.com/mtdowling"
+                },
+                {
+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
                 }
             ],
             "description": "Guzzle is a PHP HTTP client library",
@@ -68,30 +80,54 @@
                 "framework",
                 "http",
                 "http client",
+                "psr-18",
+                "psr-7",
                 "rest",
                 "web service"
             ],
-            "time": "2020-06-16T21:01:06+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/guzzle/issues",
+                "source": "https://github.com/guzzle/guzzle/tree/7.3.0"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/GrahamCampbell",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/Nyholm",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/alexeyshockov",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/gmponos",
+                    "type": "github"
+                }
+            ],
+            "time": "2021-03-23T11:33:13+00:00"
         },
         {
             "name": "guzzlehttp/promises",
-            "version": "v1.3.1",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/guzzle/promises.git",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646"
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d"
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             "dist": {
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-                "url": "https://api.github.com/repos/guzzle/promises/zipball/a59da6cf61d80060647ff4d3eb2c03a2bc694646",
-                "reference": "a59da6cf61d80060647ff4d3eb2c03a2bc694646",
+                "url": "https://api.github.com/repos/guzzle/promises/zipball/8e7d04f1f6450fef59366c399cfad4b9383aa30d",
+                "reference": "8e7d04f1f6450fef59366c399cfad4b9383aa30d",
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             },
             "require": {
-                "php": ">=5.5.0"
+                "php": ">=5.5"
             },
             "require-dev": {
-                "phpunit/phpunit": "^4.0"
+                "symfony/phpunit-bridge": "^4.4 || ^5.1"
             },
             "type": "library",
             "extra": {
@@ -122,50 +158,54 @@
             "keywords": [
                 "promise"
             ],
-            "time": "2016-12-20T10:07:11+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/promises/issues",
+                "source": "https://github.com/guzzle/promises/tree/1.4.1"
+            },
+            "time": "2021-03-07T09:25:29+00:00"
         },
         {
             "name": "guzzlehttp/psr7",
-            "version": "1.6.1",
+            "version": "2.0.0",
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                 "type": "git",
                 "url": "https://github.com/guzzle/psr7.git",
-                "reference": "239400de7a173fe9901b9ac7c06497751f00727a"
+                "reference": "1dc8d9cba3897165e16d12bb13d813afb1eb3fe7"
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+                "php": "^7.2.5 || ^8.0",
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+                "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
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                 {
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                     "homepage": "https://github.com/Tobion"
+                },
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+                    "name": "Márk Sági-Kazár",
+                    "email": "mark.sagikazar@gmail.com",
+                    "homepage": "https://sagikazarmark.hu"
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@@ -193,7 +238,11 @@
                 "uri",
                 "url"
             ],
-            "time": "2019-07-01T23:21:34+00:00"
+            "support": {
+                "issues": "https://github.com/guzzle/psr7/issues",
+                "source": "https://github.com/guzzle/psr7/tree/2.0.0"
+            },
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         },
         {
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@@ -246,76 +295,85 @@
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         },
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-            "version": "v9.99.99",
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-                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
+                "url": "https://github.com/php-fig/container.git",
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-            "suggest": {
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             ],
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                 {
-                    "name": "Paragon Initiative Enterprises",
-                    "email": "security@paragonie.com",
-                    "homepage": "https://paragonie.com"
+                    "name": "PHP-FIG",
+                    "homepage": "https://www.php-fig.org/"
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             ],
-            "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
+            "description": "Common Container Interface (PHP FIG PSR-11)",
+            "homepage": "https://github.com/php-fig/container",
             "keywords": [
-                "csprng",
-                "polyfill",
-                "pseudorandom",
-                "random"
+                "PSR-11",
+                "container",
+                "container-interface",
+                "container-interop",
+                "psr"
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-            "time": "2018-07-02T15:55:56+00:00"
+            "support": {
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         },
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-            "version": "2.0.1",
+            "name": "psr/http-client",
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+                "url": "https://github.com/php-fig/http-client.git",
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             "keywords": [
-                "PSR-11",
-                "container",
-                "container-interface",
-                "container-interop",
-                "psr"
+                "http",
+                "http-client",
+                "psr",
+                "psr-18"
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-                "issues": "https://github.com/php-fig/container/issues",
-                "source": "https://github.com/php-fig/container/tree/2.0.1"
+                "source": "https://github.com/php-fig/http-client/tree/master"
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-            "time": "2021-03-24T13:40:57+00:00"
+            "time": "2020-06-29T06:28:15+00:00"
         },
         {
             "name": "psr/http-factory",
@@ -653,6 +709,10 @@
                 }
             ],
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+            "support": {
+                "issues": "https://github.com/ralouphie/getallheaders/issues",
+                "source": "https://github.com/ralouphie/getallheaders/tree/develop"
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@@ -768,322 +828,6 @@
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@@ -1094,5 +838,5 @@
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