diff --git a/01-simple-application/web-application/composer.json b/01-simple-application/web-application/composer.json
index f92557a..29c447e 100644
--- a/01-simple-application/web-application/composer.json
+++ b/01-simple-application/web-application/composer.json
@@ -11,6 +11,6 @@
         "slim/slim": "4.8.0",
         "guzzlehttp/guzzle": "7.2.0",
         "guzzlehttp/psr7": "1.8.1",
-        "http-interop/http-factory-guzzle": "1.0.0"
+        "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 00a9910..b9ee465 100644
--- a/01-simple-application/web-application/composer.lock
+++ b/01-simple-application/web-application/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "fe860eb4896a48e5f97a42de8937ddb8",
+    "content-hash": "760dd1202bf02d110f0c75c496eb2940",
     "packages": [
         {
             "name": "guzzlehttp/guzzle",
@@ -240,28 +240,32 @@
         },
         {
             "name": "http-interop/http-factory-guzzle",
-            "version": "1.0.0",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/http-interop/http-factory-guzzle.git",
-                "reference": "34861658efb9899a6618cef03de46e2a52c80fc0"
+                "reference": "8f06e92b95405216b237521cc64c804dd44c4a81"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/http-interop/http-factory-guzzle/zipball/34861658efb9899a6618cef03de46e2a52c80fc0",
-                "reference": "34861658efb9899a6618cef03de46e2a52c80fc0",
+                "url": "https://api.github.com/repos/http-interop/http-factory-guzzle/zipball/8f06e92b95405216b237521cc64c804dd44c4a81",
+                "reference": "8f06e92b95405216b237521cc64c804dd44c4a81",
                 "shasum": ""
             },
             "require": {
-                "guzzlehttp/psr7": "^1.4.2",
+                "guzzlehttp/psr7": "^1.7||^2.0",
+                "php": ">=7.3",
                 "psr/http-factory": "^1.0"
             },
             "provide": {
                 "psr/http-factory-implementation": "^1.0"
             },
             "require-dev": {
-                "http-interop/http-factory-tests": "^0.5",
-                "phpunit/phpunit": "^6.5"
+                "http-interop/http-factory-tests": "^0.9",
+                "phpunit/phpunit": "^9.5"
+            },
+            "suggest": {
+                "guzzlehttp/psr7": "Includes an HTTP factory starting in version 2.0"
             },
             "type": "library",
             "autoload": {
@@ -288,9 +292,9 @@
             ],
             "support": {
                 "issues": "https://github.com/http-interop/http-factory-guzzle/issues",
-                "source": "https://github.com/http-interop/http-factory-guzzle/tree/master"
+                "source": "https://github.com/http-interop/http-factory-guzzle/tree/1.2.0"
             },
-            "time": "2018-07-31T19:32:56+00:00"
+            "time": "2021-07-21T13:50:14+00:00"
         },
         {
             "name": "nikic/fast-route",
@@ -886,5 +890,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "2.0.0"
+    "plugin-api-version": "2.1.0"
 }