diff --git a/Dockerfile b/Dockerfile
index e888054bc..539e1eef1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@
 # Must override builder-base, not builder, since the latter is referred to later in the file and so must not be
 # directly replaced. See here, and note that "stage" parameter mentioned there has been renamed to
 # "build-context": https://github.com/docker/buildx/pull/904#issuecomment-1005871838
-FROM golang:1.25.9-bookworm@sha256:298734aec230b5f3e8cee450ce6d7eccc39f1797ba548ee90d57e9803030c6c3 AS builder-base
+FROM golang:1.26.3-bookworm@sha256:252599aeb51ad60b83e4d8821802068127c528c707cb7dd7afd93be057c6011c AS builder-base
 FROM --platform=$BUILDPLATFORM builder-base AS builder
 
 ARG TARGETARCH
diff --git a/Dockerfile.windows b/Dockerfile.windows
index 4fe8d715a..95568e715 100644
--- a/Dockerfile.windows
+++ b/Dockerfile.windows
@@ -5,7 +5,7 @@
 # Must override builder-base, not builder, since the latter is referred to later in the file and so must not be
 # directly replaced. See here, and note that "stage" parameter mentioned there has been renamed to
 # "build-context": https://github.com/docker/buildx/pull/904#issuecomment-1005871838
-FROM --platform=linux/$BUILDARCH golang:1.25.9-bookworm@sha256:298734aec230b5f3e8cee450ce6d7eccc39f1797ba548ee90d57e9803030c6c3 AS builder-base
+FROM --platform=linux/$BUILDARCH golang:1.26.3-bookworm@sha256:252599aeb51ad60b83e4d8821802068127c528c707cb7dd7afd93be057c6011c AS builder-base
 FROM --platform=linux/$BUILDARCH builder-base AS builder
 
 ARG TARGETARCH