diff --git a/example/http/Dockerfile b/example/http/Dockerfile
index 7d54601..445a439 100644
--- a/example/http/Dockerfile
+++ b/example/http/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.21.5
+FROM golang:1.25.4@sha256:e68f6a00e88586577fafa4d9cefad1349c2be70d21244321321c407474ff9bf2
 
 WORKDIR /go/src/app