diff --git a/composer.dev.json b/composer.dev.json
index 2c3ecf7..d4e01f1 100644
--- a/composer.dev.json
+++ b/composer.dev.json
@@ -6,8 +6,8 @@
         "composer/installers": "^1.9",
         "cweagans/composer-patches": "^1.6.0",
         "drupal/core-composer-scaffold": "^10.0",
-        "drupal/core": "10.3.x",
-        "drupal/core-recommended": "10.3.x",
+        "drupal/core": "10.3.12",
+        "drupal/core-recommended": "10.3.12",
         "drush/drush": "^12",
         "vlucas/phpdotenv": "^4.1",
         "webflo/drupal-finder": "^1.0"