diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 45d37d5..04d9081 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@sha256:8da9de84573d9a2ab150fd10a1ed38fdb27065f8020bcfe1cb49f8456db42ced'
     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@sha256:2bb3ccae716ecfb9766fd602b5ce3033b12086bb905af0061e02f5aaf32b09fa'
     args:
       - clone
       - ${_SOURCE_SSH_URL}/${REPO_NAME}