diff --git a/integration/cloudbuild/testbase/Dockerfile b/integration/cloudbuild/testbase/Dockerfile
index 09915d8bd1..1028d312b7 100644
--- a/integration/cloudbuild/testbase/Dockerfile
+++ b/integration/cloudbuild/testbase/Dockerfile
@@ -1,5 +1,5 @@
 # This Dockerfile builds a base image for Trillan integration tests.
-FROM golang:1.21.3-bookworm@sha256:deebfdaab16f8508e2590048d416b451e76ebe22e487cafd68990ff28f93ab1c
+FROM golang:1.21.3-bookworm@sha256:5bafbbb109f02aaf6b41ddc19f54919773c3006f1cbda1599112603367642f0e
 
 WORKDIR /testbase