diff --git a/examples/custom-builder/custom/Dockerfile b/examples/custom-builder/custom/Dockerfile
index 603573faa..fbf43e778 100644
--- a/examples/custom-builder/custom/Dockerfile
+++ b/examples/custom-builder/custom/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.17-alpine
+FROM golang:1.26rc2-alpine
 
 ADD . /go/src/app
 WORKDIR /go/src/app