diff --git a/upstream-builder.Dockerfile b/upstream-builder.Dockerfile
index fc888d5a1..4c5081db3 100644
--- a/upstream-builder.Dockerfile
+++ b/upstream-builder.Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.26.5-alpine AS builder
+FROM golang:1.26.6-alpine AS builder
 
 RUN apk update && apk add build-base git mercurial bash linux-headers
 WORKDIR /build