diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 45d37d5..82e3cce 100644
--- a/cloudbuild.yaml
+++ b/cloudbuild.yaml
@@ -1,6 +1,6 @@
 steps:
   - id: setup
-    name: 'gcr.io/cloud-builders/gcloud'
+    name: 'gcr.io/cloud-builders/gcloud@sha256:46e6289806bc317cb06c2476ee53631d3e0046edb6743ef4486fd38f13f5ff93'
     entrypoint: 'bash'
     args:
       - '-e'
@@ -31,7 +31,7 @@ steps:
         path: /root
 
   - id: get_full_history
-    name: 'gcr.io/cloud-builders/git'
+    name: 'gcr.io/cloud-builders/git@sha256:a0040ee3b9751c1f7532a09bb4a1cf24987359990547830293cf85a81fd7a82f'
     args:
       - clone
       - ${_SOURCE_SSH_URL}/${REPO_NAME}