diff --git a/integration/cloudbuild/testbase/Dockerfile b/integration/cloudbuild/testbase/Dockerfile
index 54f1b1118a..468e5f5494 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:1.21.4-bookworm@sha256:52362e252f452df17c24131b021bf2ebf1c9869f65c28f88ddb326191defea9c
+FROM golang:1.21.5-bookworm@sha256:a6b787c7f9046e3fdaa97bca1f76fd23ff4108f612de885e1af87e0dccc02f99
 
 WORKDIR /testbase