diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 45d37d5..308ad03 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:abcad906c9fa0dd063c4b6e570994f34024673486b17e9f4c99c720165e03ae5'
     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@sha256:97a3544b3e3f1f86621ed531710b73f1a30d9dee5345a27147ddd3203b92ddbf'
     args:
       - clone
       - ${_SOURCE_SSH_URL}/${REPO_NAME}