diff --git a/composer.json b/composer.json
index edfedd451cf692727188134caaf890a20d37ec28..e63ce508e85c47fca5b584f8ede3baf7ee078e1c 100644
--- a/composer.json
+++ b/composer.json
@@ -7,7 +7,7 @@
         "webflo/drupal-core-strict": "*"
     },
     "require": {
-        "drupal/core": "9.0.x-dev",
+        "drupal/core": "9.0.0-alpha1",
         "asm89/stack-cors": "1.3.0",
         "composer/installers": "v1.7.0",
         "composer/semver": "1.5.1",