diff --git a/composer.json b/composer.json
index 959f14a..17a9f04 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
     },
     "require-dev": {
         "google/cloud-tools": "dev-main",
-        "squizlabs/php_codesniffer": "^3.5",
+        "squizlabs/php_codesniffer": "^4.0",
         "phpunit/phpunit": "^10.0",
         "friendsofphp/php-cs-fixer": "^3.46"
     },
diff --git a/samples/composer.json b/samples/composer.json
index 7ccf4fe..726d8f7 100644
--- a/samples/composer.json
+++ b/samples/composer.json
@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "google/cloud-tools": "dev-main",
-        "squizlabs/php_codesniffer": "^3.5",
+        "squizlabs/php_codesniffer": "^4.0",
         "friendsofphp/php-cs-fixer": "^3.46"
     },
     "scripts": {