diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 45d37d5..6e18df3 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:e5ee9968d3772b72bcd586993fbe60aeee7f7206a0b2738382be86f06b90a9de'
     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@sha256:3f59e6b1627e7a4fa4d0098cf6a2e5f5b30e92ceb0ff8e4f1c05dc28e739ec3b'
     args:
       - clone
       - ${_SOURCE_SSH_URL}/${REPO_NAME}