diff --git a/.woodpecker/backend.yaml b/.woodpecker/backend.yaml
index 25fb763..5ba5d65 100644
--- a/.woodpecker/backend.yaml
+++ b/.woodpecker/backend.yaml
@@ -59,7 +59,7 @@ steps:
           if helm upgrade marktvogt ./helm/marktvogt/ \
               --namespace tenant-2 \
               --reuse-values \
-              --set backend.image.tag="${CI_COMMIT_SHA:0:8}" \
+              --set-string backend.image.tag="${CI_COMMIT_SHA:0:8}" \
               --rollback-on-failure \
               --wait=watcher \
               --timeout 5m
diff --git a/.woodpecker/web.yaml b/.woodpecker/web.yaml
index fc6c4b7..84d2ca4 100644
--- a/.woodpecker/web.yaml
+++ b/.woodpecker/web.yaml
@@ -66,7 +66,7 @@ steps:
           if helm upgrade marktvogt ./helm/marktvogt/ \
               --namespace tenant-2 \
               --reuse-values \
-              --set web.image.tag="${CI_COMMIT_SHA:0:8}" \
+              --set-string web.image.tag="${CI_COMMIT_SHA:0:8}" \
               --rollback-on-failure \
               --wait=watcher \
               --timeout 5m