diff --git a/Dockerfile b/Dockerfile
index 733fb5e37..cefeecf0e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,7 +17,7 @@
 # This image is also the single source of truth for the Go toolchain: CI reads the
 # version out of this line (see .github/scripts/go-version.sh) so tests and images
 # always run the same runtime.
-FROM golang:1.27.3-alpine3.24@sha256:f2c872bcee949b7be9c490efd02b48a8a2fbf947cdf533f1c58525ec9d8170fd AS builder
+FROM golang:1.27.3-alpine3.24@sha256:b8c9b82affbbb82a020bbcf998dad2ba9516944ac7e883524642a481a9505e9c AS builder
 
 ARG TARGETPLATFORM
 ARG TARGETARCH
diff --git a/cmd/test-server/Dockerfile b/cmd/test-server/Dockerfile
index 17ab6cd39..3314f6f6a 100644
--- a/cmd/test-server/Dockerfile
+++ b/cmd/test-server/Dockerfile
@@ -17,7 +17,7 @@
 #
 # Pinned by digest so the build is reproducible even if the tag is republished.
 # The tag is kept alongside it for readability; Renovate updates both together.
-FROM golang:1.27.3-alpine3.24@sha256:f2c872bcee949b7be9c490efd02b48a8a2fbf947cdf533f1c58525ec9d8170fd AS builder
+FROM golang:1.27.3-alpine3.24@sha256:b8c9b82affbbb82a020bbcf998dad2ba9516944ac7e883524642a481a9505e9c AS builder
 
 ARG TARGETARCH