diff --git a/Dockerfile b/Dockerfile
index 68c37f9..4f5623e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 # in per platform. The CI runner has no binfmt registration and no way to get one (the
 # JS action that used to install it cannot run there), so this is not just an
 # optimisation -- it is what makes the arm64 image buildable at all.
-FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS builder
+FROM --platform=$BUILDPLATFORM golang:1.26.9-alpine AS builder
 WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download