diff --git a/composer.json b/composer.json
index 88d322628..2716de573 100644
--- a/composer.json
+++ b/composer.json
@@ -77,7 +77,7 @@
 		"tubalmartin/cssmin": "^4.1",
 		"wptt/webfont-loader": "^1.1",
 		"sabberworm/php-css-parser": "^8.4",
-		"stripe/stripe-php": "^15.3",
+		"stripe/stripe-php": "^21.3",
 		"enshrined/svg-sanitize": "^0.21.0"
 	}
 }
diff --git a/composer.lock b/composer.lock
index 439b236c2..7627857c5 100644
--- a/composer.lock
+++ b/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": "5a247aa373965f7dae85a8a3c4b3cb01",
+    "content-hash": "8bd17a7c8d52a5b1b3c1be81e265f752",
     "packages": [
         {
             "name": "codeinwp/themeisle-sdk",
@@ -227,28 +227,28 @@
         },
         {
             "name": "stripe/stripe-php",
-            "version": "v15.10.0",
+            "version": "v21.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/stripe/stripe-php.git",
-                "reference": "3df1a19a33477af9ead8984dbd84e8f637c36199"
+                "reference": "12986995cd5e229cc094d4b57de056f8e2e6e5a9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/stripe/stripe-php/zipball/3df1a19a33477af9ead8984dbd84e8f637c36199",
-                "reference": "3df1a19a33477af9ead8984dbd84e8f637c36199",
+                "url": "https://api.github.com/repos/stripe/stripe-php/zipball/12986995cd5e229cc094d4b57de056f8e2e6e5a9",
+                "reference": "12986995cd5e229cc094d4b57de056f8e2e6e5a9",
                 "shasum": ""
             },
             "require": {
                 "ext-curl": "*",
                 "ext-json": "*",
                 "ext-mbstring": "*",
-                "php": ">=5.6.0"
+                "php": ">=7.2.0"
             },
             "require-dev": {
-                "friendsofphp/php-cs-fixer": "3.5.0",
+                "friendsofphp/php-cs-fixer": "3.94.0",
                 "phpstan/phpstan": "^1.2",
-                "phpunit/phpunit": "^5.7 || ^9.0"
+                "phpunit/phpunit": "^8.0 || ^9.0"
             },
             "type": "library",
             "extra": {
@@ -257,6 +257,9 @@
                 }
             },
             "autoload": {
+                "files": [
+                    "lib/version_check.php"
+                ],
                 "psr-4": {
                     "Stripe\\": "lib/"
                 }
@@ -280,9 +283,9 @@
             ],
             "support": {
                 "issues": "https://github.com/stripe/stripe-php/issues",
-                "source": "https://github.com/stripe/stripe-php/tree/v15.10.0"
+                "source": "https://github.com/stripe/stripe-php/tree/v21.3.1"
             },
-            "time": "2024-09-18T18:38:30+00:00"
+            "time": "2026-09-01T18:42:58+00:00"
         },
         {
             "name": "tubalmartin/cssmin",