diff --git a/.woodpecker/pr.yml b/.woodpecker/pr.yml
index f78bbd7..ee1ac30 100644
--- a/.woodpecker/pr.yml
+++ b/.woodpecker/pr.yml
@@ -1,7 +1,7 @@
 ---
 steps:
   pr-lint:
-    image: alpine/helm
+    image: alpine/helm@sha256:9b25e60ae264940b276e32866d37e3088e70c4e2d1784b964dc3f90346281a74
     environment:
       USE_SSH: "true"
       GIT_USER: $DRONE_COMMIT_AUTHOR
diff --git a/.woodpecker/release.yml b/.woodpecker/release.yml
index c4dd467..74f6e3a 100644
--- a/.woodpecker/release.yml
+++ b/.woodpecker/release.yml
@@ -1,7 +1,7 @@
 ---
 steps:
   helm-repo:
-    image: quay.io/helmpack/chart-releaser
+    image: quay.io/helmpack/chart-releaser@sha256:5cff8ea6db07bc600131fb3a060b988bf6fb7ddf31b91d78efd852403615481c
     commands:
     - git config --global user.email "noreply@lib42.github.io"
     - git config --global user.name "Woodpecker-CI"