diff --git a/Dockerfile b/Dockerfile
index c1eeca1..2c0fe35 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@
 # =============================================================================
 # Stage 1: Build Tailscale combined binary (cross-compiled, runs natively)
 # =============================================================================
-FROM --platform=$BUILDPLATFORM golang:1.26.4-alpine@sha256:f23e8b227fb4493eabe03bede4d5a32d04092da71962f1fb79b5f7d1e6c2a17f AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.4-alpine@sha256:a6a091eac01ceac4b97496fe2957a49b6cdd83365337d5f46f6f73710424e805 AS builder
 
 # renovate: datasource=github-releases depName=tailscale packageName=tailscale/tailscale versioning=semver
 ARG TAILSCALE_VERSION=v1.98.5