diff --git a/.woodpecker/build.yaml b/.woodpecker/build.yaml
index adfe365..f60f0b3 100644
--- a/.woodpecker/build.yaml
+++ b/.woodpecker/build.yaml
@@ -8,7 +8,7 @@ when:
 steps:
 
   build:
-    image: kokuwaio/buildctl:v0.21.0@sha256:a20248d2e8b9f5b5d7f307503093aab03bbcbc8c74269d5e7a8351dc4e34fbc8
+    image: kokuwaio/buildctl:v0.21.0
     pull: true
     settings: &settings
       name: registry.kokuwa.io/buildctl:$CI_PIPELINE_NUMBER