diff --git a/trillian/examples/deployment/docker/envsubst/Dockerfile b/trillian/examples/deployment/docker/envsubst/Dockerfile
index 54944a24ec..77c974ab23 100644
--- a/trillian/examples/deployment/docker/envsubst/Dockerfile
+++ b/trillian/examples/deployment/docker/envsubst/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.8@sha256:82d1e9d7ed48a7523bdebc18cf6290bdb97b82302a8a9c27d4fe885949ea94d1
+FROM alpine:3.18@sha256:7144f7bab3d4c2648d7e59409f15ec52a18006a128c733fcff20d3a4a54ba44a
 
 RUN apk add --no-cache gettext