diff --git a/composer.json b/composer.json
index c79384c..63882ab 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
     "source": "https://git.drupalcode.org/project/twig_tweak"
   },
   "require": {
-    "drupal/core": "^8.7"
+    "drupal/core": "^8.7 || ^9.0"
   },
   "suggest": {
     "symfony/var-dumper": "Better dump() function for debugging Twig variables"