diff --git a/.woodpecker/alertmanager-ntfy.yaml b/.woodpecker/alertmanager-ntfy.yaml
index fa59558..f80e70c 100644
--- a/.woodpecker/alertmanager-ntfy.yaml
+++ b/.woodpecker/alertmanager-ntfy.yaml
@@ -6,9 +6,9 @@ workspace:
 
 matrix:
   ALERTMANAGER_NTFY_VERSION:
-    - 76d5f772f70d6915c89da00414c20009b03cc361
+    - "76d5f772f70d6915c89da00414c20009b03cc361"
   IMAGE_NAME:
-    - git.hamburg.ccc.de/ccchh/oci-images/alertmanager-ntfy
+    - "git.hamburg.ccc.de/ccchh/oci-images/alertmanager-ntfy"
 
 steps:
   - name: setup