diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 04192667a..b8c8fd90e 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -2,7 +2,7 @@ name: docker
 
 on:
   schedule:
-    - cron '30 18 * * *'
+    - cron: '30 18 * * *'
 
 env:
   CERBERUS_IMAGE_ID: ghcr.io/rems-project/cerberus/cn:release