diff --git a/composer.lock b/composer.lock
index 89bc760..41e452c 100644
--- a/composer.lock
+++ b/composer.lock
@@ -87,16 +87,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.11.1",
+            "version": "1.12.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c"
+                "reference": "3a6b9a42cd8f8771bd4295d13e1423fa7f3d942c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
-                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/3a6b9a42cd8f8771bd4295d13e1423fa7f3d942c",
+                "reference": "3a6b9a42cd8f8771bd4295d13e1423fa7f3d942c",
                 "shasum": ""
             },
             "require": {
@@ -104,11 +104,12 @@
             },
             "conflict": {
                 "doctrine/collections": "<1.6.8",
-                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+                "doctrine/common": "<2.13.3 || >=3 <3.2.2"
             },
             "require-dev": {
                 "doctrine/collections": "^1.6.8",
                 "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpspec/prophecy": "^1.10",
                 "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
             },
             "type": "library",
@@ -134,7 +135,7 @@
             ],
             "support": {
                 "issues": "https://github.com/myclabs/DeepCopy/issues",
-                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.1"
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.12.0"
             },
             "funding": [
                 {
@@ -142,20 +143,20 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2023-03-08T13:26:56+00:00"
+            "time": "2024-06-12T14:39:25+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v5.0.2",
+            "version": "v5.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13"
+                "reference": "683130c2ff8c2739f4822ff7ac5c873ec529abd1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/139676794dc1e9231bf7bcd123cfc0c99182cb13",
-                "reference": "139676794dc1e9231bf7bcd123cfc0c99182cb13",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/683130c2ff8c2739f4822ff7ac5c873ec529abd1",
+                "reference": "683130c2ff8c2739f4822ff7ac5c873ec529abd1",
                 "shasum": ""
             },
             "require": {
@@ -166,7 +167,7 @@
             },
             "require-dev": {
                 "ircmaxell/php-yacc": "^0.0.7",
-                "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0"
+                "phpunit/phpunit": "^9.0"
             },
             "bin": [
                 "bin/php-parse"
@@ -198,9 +199,9 @@
             ],
             "support": {
                 "issues": "https://github.com/nikic/PHP-Parser/issues",
-                "source": "https://github.com/nikic/PHP-Parser/tree/v5.0.2"
+                "source": "https://github.com/nikic/PHP-Parser/tree/v5.1.0"
             },
-            "time": "2024-03-05T20:51:40+00:00"
+            "time": "2024-07-01T20:03:41+00:00"
         },
         {
             "name": "phar-io/manifest",
@@ -400,22 +401,22 @@
         },
         {
             "name": "phpcsstandards/phpcsutils",
-            "version": "1.0.11",
+            "version": "1.0.12",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCSStandards/PHPCSUtils.git",
-                "reference": "c457da9dabb60eb7106dd5e3c05132b1a6539c6a"
+                "reference": "87b233b00daf83fb70f40c9a28692be017ea7c6c"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/c457da9dabb60eb7106dd5e3c05132b1a6539c6a",
-                "reference": "c457da9dabb60eb7106dd5e3c05132b1a6539c6a",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHPCSUtils/zipball/87b233b00daf83fb70f40c9a28692be017ea7c6c",
+                "reference": "87b233b00daf83fb70f40c9a28692be017ea7c6c",
                 "shasum": ""
             },
             "require": {
                 "dealerdirect/phpcodesniffer-composer-installer": "^0.4.1 || ^0.5 || ^0.6.2 || ^0.7 || ^1.0",
                 "php": ">=5.4",
-                "squizlabs/php_codesniffer": "^3.9.0 || 4.0.x-dev@dev"
+                "squizlabs/php_codesniffer": "^3.10.0 || 4.0.x-dev@dev"
             },
             "require-dev": {
                 "ext-filter": "*",
@@ -484,36 +485,36 @@
                     "type": "open_collective"
                 }
             ],
-            "time": "2024-04-24T11:47:18+00:00"
+            "time": "2024-05-20T13:34:27+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "10.1.14",
+            "version": "10.1.16",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "e3f51450ebffe8e0efdf7346ae966a656f7d5e5b"
+                "reference": "7e308268858ed6baedc8704a304727d20bc07c77"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/e3f51450ebffe8e0efdf7346ae966a656f7d5e5b",
-                "reference": "e3f51450ebffe8e0efdf7346ae966a656f7d5e5b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/7e308268858ed6baedc8704a304727d20bc07c77",
+                "reference": "7e308268858ed6baedc8704a304727d20bc07c77",
                 "shasum": ""
             },
             "require": {
                 "ext-dom": "*",
                 "ext-libxml": "*",
                 "ext-xmlwriter": "*",
-                "nikic/php-parser": "^4.18 || ^5.0",
+                "nikic/php-parser": "^4.19.1 || ^5.1.0",
                 "php": ">=8.1",
-                "phpunit/php-file-iterator": "^4.0",
-                "phpunit/php-text-template": "^3.0",
-                "sebastian/code-unit-reverse-lookup": "^3.0",
-                "sebastian/complexity": "^3.0",
-                "sebastian/environment": "^6.0",
-                "sebastian/lines-of-code": "^2.0",
-                "sebastian/version": "^4.0",
-                "theseer/tokenizer": "^1.2.0"
+                "phpunit/php-file-iterator": "^4.1.0",
+                "phpunit/php-text-template": "^3.0.1",
+                "sebastian/code-unit-reverse-lookup": "^3.0.0",
+                "sebastian/complexity": "^3.2.0",
+                "sebastian/environment": "^6.1.0",
+                "sebastian/lines-of-code": "^2.0.2",
+                "sebastian/version": "^4.0.1",
+                "theseer/tokenizer": "^1.2.3"
             },
             "require-dev": {
                 "phpunit/phpunit": "^10.1"
@@ -525,7 +526,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "10.1-dev"
+                    "dev-main": "10.1.x-dev"
                 }
             },
             "autoload": {
@@ -554,7 +555,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
                 "security": "https://github.com/sebastianbergmann/php-code-coverage/security/policy",
-                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/10.1.14"
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/10.1.16"
             },
             "funding": [
                 {
@@ -562,7 +563,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-03-12T15:33:41+00:00"
+            "time": "2024-08-22T04:31:57+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -809,16 +810,16 @@
         },
         {
             "name": "phpunit/phpunit",
-            "version": "10.5.20",
+            "version": "10.5.30",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "547d314dc24ec1e177720d45c6263fb226cc2ae3"
+                "reference": "b15524febac0153876b4ba9aab3326c2ee94c897"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/547d314dc24ec1e177720d45c6263fb226cc2ae3",
-                "reference": "547d314dc24ec1e177720d45c6263fb226cc2ae3",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/b15524febac0153876b4ba9aab3326c2ee94c897",
+                "reference": "b15524febac0153876b4ba9aab3326c2ee94c897",
                 "shasum": ""
             },
             "require": {
@@ -828,26 +829,26 @@
                 "ext-mbstring": "*",
                 "ext-xml": "*",
                 "ext-xmlwriter": "*",
-                "myclabs/deep-copy": "^1.10.1",
-                "phar-io/manifest": "^2.0.3",
-                "phar-io/version": "^3.0.2",
+                "myclabs/deep-copy": "^1.12.0",
+                "phar-io/manifest": "^2.0.4",
+                "phar-io/version": "^3.2.1",
                 "php": ">=8.1",
-                "phpunit/php-code-coverage": "^10.1.5",
-                "phpunit/php-file-iterator": "^4.0",
-                "phpunit/php-invoker": "^4.0",
-                "phpunit/php-text-template": "^3.0",
-                "phpunit/php-timer": "^6.0",
-                "sebastian/cli-parser": "^2.0",
-                "sebastian/code-unit": "^2.0",
-                "sebastian/comparator": "^5.0",
-                "sebastian/diff": "^5.0",
-                "sebastian/environment": "^6.0",
-                "sebastian/exporter": "^5.1",
-                "sebastian/global-state": "^6.0.1",
-                "sebastian/object-enumerator": "^5.0",
-                "sebastian/recursion-context": "^5.0",
-                "sebastian/type": "^4.0",
-                "sebastian/version": "^4.0"
+                "phpunit/php-code-coverage": "^10.1.15",
+                "phpunit/php-file-iterator": "^4.1.0",
+                "phpunit/php-invoker": "^4.0.0",
+                "phpunit/php-text-template": "^3.0.1",
+                "phpunit/php-timer": "^6.0.0",
+                "sebastian/cli-parser": "^2.0.1",
+                "sebastian/code-unit": "^2.0.0",
+                "sebastian/comparator": "^5.0.2",
+                "sebastian/diff": "^5.1.1",
+                "sebastian/environment": "^6.1.0",
+                "sebastian/exporter": "^5.1.2",
+                "sebastian/global-state": "^6.0.2",
+                "sebastian/object-enumerator": "^5.0.0",
+                "sebastian/recursion-context": "^5.0.0",
+                "sebastian/type": "^4.0.0",
+                "sebastian/version": "^4.0.1"
             },
             "suggest": {
                 "ext-soap": "To be able to generate mocks based on WSDL files"
@@ -890,7 +891,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/phpunit/issues",
                 "security": "https://github.com/sebastianbergmann/phpunit/security/policy",
-                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.20"
+                "source": "https://github.com/sebastianbergmann/phpunit/tree/10.5.30"
             },
             "funding": [
                 {
@@ -906,7 +907,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2024-04-24T06:32:35+00:00"
+            "time": "2024-08-13T06:09:37+00:00"
         },
         {
             "name": "sebastian/cli-parser",
@@ -1078,16 +1079,16 @@
         },
         {
             "name": "sebastian/comparator",
-            "version": "5.0.1",
+            "version": "5.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/comparator.git",
-                "reference": "2db5010a484d53ebf536087a70b4a5423c102372"
+                "reference": "2d3e04c3b4c1e84a5e7382221ad8883c8fbc4f53"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/2db5010a484d53ebf536087a70b4a5423c102372",
-                "reference": "2db5010a484d53ebf536087a70b4a5423c102372",
+                "url": "https://api.github.com/repos/sebastianbergmann/comparator/zipball/2d3e04c3b4c1e84a5e7382221ad8883c8fbc4f53",
+                "reference": "2d3e04c3b4c1e84a5e7382221ad8883c8fbc4f53",
                 "shasum": ""
             },
             "require": {
@@ -1098,7 +1099,7 @@
                 "sebastian/exporter": "^5.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "^10.3"
+                "phpunit/phpunit": "^10.4"
             },
             "type": "library",
             "extra": {
@@ -1143,7 +1144,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/comparator/issues",
                 "security": "https://github.com/sebastianbergmann/comparator/security/policy",
-                "source": "https://github.com/sebastianbergmann/comparator/tree/5.0.1"
+                "source": "https://github.com/sebastianbergmann/comparator/tree/5.0.2"
             },
             "funding": [
                 {
@@ -1151,7 +1152,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2023-08-14T13:18:12+00:00"
+            "time": "2024-08-12T06:03:08+00:00"
         },
         {
             "name": "sebastian/complexity",
@@ -1826,16 +1827,16 @@
         },
         {
             "name": "squizlabs/php_codesniffer",
-            "version": "3.9.2",
+            "version": "3.10.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer.git",
-                "reference": "aac1f6f347a5c5ac6bc98ad395007df00990f480"
+                "reference": "86e5f5dd9a840c46810ebe5ff1885581c42a3017"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/aac1f6f347a5c5ac6bc98ad395007df00990f480",
-                "reference": "aac1f6f347a5c5ac6bc98ad395007df00990f480",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/86e5f5dd9a840c46810ebe5ff1885581c42a3017",
+                "reference": "86e5f5dd9a840c46810ebe5ff1885581c42a3017",
                 "shasum": ""
             },
             "require": {
@@ -1902,7 +1903,7 @@
                     "type": "open_collective"
                 }
             ],
-            "time": "2024-04-23T20:25:34+00:00"
+            "time": "2024-07-21T23:26:44+00:00"
         },
         {
             "name": "theseer/tokenizer",
diff --git a/omnisend/includes/SDK/V1/class-client.php b/omnisend/includes/SDK/V1/class-client.php
index fafacf9..20e29c8 100644
--- a/omnisend/includes/SDK/V1/class-client.php
+++ b/omnisend/includes/SDK/V1/class-client.php
@@ -21,7 +21,6 @@ interface Client {
 	 * @param Contact $contact
 	 *
 	 * @return CreateContactResponse
-	 * 
 	 * @deprecated Use save_contact() instead.
 	 */
 	public function create_contact( $contact ): CreateContactResponse;
diff --git a/tests/Omnisend/SDK/V1/ContactTest.php b/tests/Omnisend/SDK/V1/ContactTest.php
index e0d18da..ab36551 100644
--- a/tests/Omnisend/SDK/V1/ContactTest.php
+++ b/tests/Omnisend/SDK/V1/ContactTest.php
@@ -10,7 +10,7 @@ final class ContactTest extends TestCase
     public function test_validation(): void
     {
         // Test valid contact
-        $contact_data = ['email' => 'test@example.com'];
+        $contact_data = ['email' => '@example.com'];
         $contact = ContactFactory::create_contact($contact_data);
         $this->assertFalse($contact->validate()->has_errors());