diff --git a/action.yml b/action.yml
index 592bad1..2affeff 100644
--- a/action.yml
+++ b/action.yml
@@ -173,7 +173,7 @@ outputs:
     description: The number of changed lines in the diff. (Only available in PR mode)
 runs:
   using: docker
-  image: Dockerfile
+  image: docker://ghcr.io/step-security/python-coverage-comment-action:v4.3.0@sha256:8235394ddbf3412362d708d5c1f7c7dd67119f2953fa47661507d9214869a3b7 #v4.3.0
   env:
     ACTIVITY: ${{ inputs.ACTIVITY }}
     GITHUB_BASE_URL: ${{ inputs.GITHUB_BASE_URL }}