diff --git a/Dockerfile b/Dockerfile
index 8d57e18..dea54f2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@
 # `glabs-web` at `./cmd/glabs-web`); this image builds ONLY the web server.
 # The mail templates are embedded via //go:embed (web/mail/tmpl), so no assets
 # need to be copied into the runtime stage.
-FROM golang:1.26-alpine AS builder
+FROM golang:1.27-alpine AS builder
 WORKDIR /src
 
 # Version metadata, passed by docker.yml from the release tag (mirrors the