diff --git a/cloudbuild.yaml b/cloudbuild.yaml
index 8f678924..7f0a4341 100644
--- a/cloudbuild.yaml
+++ b/cloudbuild.yaml
@@ -16,7 +16,9 @@
 # To promote release images, see https://github.com/kubernetes/k8s.io/tree/master/k8s.gcr.io/images/k8s-staging-sig-storage.
 
 # This must be specified in seconds. If omitted, defaults to 600s (10 mins).
-timeout: 1800s
+# Building three images in external-snapshotter takes roughly half an hour,
+# sometimes more.
+timeout: 3600s
 # This prevents errors if you don't use both _GIT_TAG and _PULL_BASE_REF,
 # or any new substitutions added in the future.
 options: