diff --git a/.github/.OwlBot.lock.yaml b/.github/.OwlBot.lock.yaml
index 1b9f82a5e53a..5ce4de60646d 100644
--- a/.github/.OwlBot.lock.yaml
+++ b/.github/.OwlBot.lock.yaml
@@ -1,2 +1,3 @@
 docker:
+  digest: sha256:a36c83b620de88ba0c6248617e928f53ebd781d9f3fe219543bc1c6b00a37899
   image: gcr.io/cloud-devrel-public-resources/owlbot-go:latest