diff --git a/composer.json b/composer.json
index 69ecd829..98a1a857 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
         "ext-rdkafka": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.4 || ^10.5",
+        "phpunit/phpunit": "^9.4 || ^10.5 || ^12.0",
         "ircmaxell/php-c-parser": "dev-master#fd8f5efefd0fcc6c5119d945694acaa3a6790ada",
         "symplify/easy-coding-standard": "^12.0",
         "klitsche/ffigen": "0.8.1",
diff --git a/resources/test-extension/composer.json b/resources/test-extension/composer.json
index 728141ab..0c7cfac1 100644
--- a/resources/test-extension/composer.json
+++ b/resources/test-extension/composer.json
@@ -9,6 +9,6 @@
         "ext-rdkafka": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9"
+        "phpunit/phpunit": "^12"
     }
 }