diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 1c8593e1..151f3df2 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -121,7 +121,7 @@ jobs:
         run: composer require --dev php-coveralls/php-coveralls --no-update
 
       - if: matrix.install-phpunit-12
-        run: composer require --dev phpunit/phpunit:^12.0.2 --no-update
+        run: composer require --dev phpunit/phpunit:^12.3.4 --no-update
 
       - run: composer update --no-progress --classmap-authoritative ${{ matrix.composer-flags }}
 
diff --git a/composer.json b/composer.json
index 98a90a76..9984da28 100644
--- a/composer.json
+++ b/composer.json
@@ -16,7 +16,7 @@
         "friendsofphp/php-cs-fixer": "^3.86"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.6.22 || 10.5.45 || ^11.5.7"
+        "phpunit/phpunit": "^9.6.24 || ^10.5.51 || ^11.5.32"
     },
     "autoload": {
         "psr-4": {