diff --git a/Dockerfile b/Dockerfile
index ba36539..4c68a44 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,7 +2,7 @@
 
 # Pinned Go version, kept up to date by Renovate. Keep in sync with ci.yml.
 # The GitHub Actions CI job sets this argument for a consistent Go version.
-ARG GO_VERSION=1.26.10
+ARG GO_VERSION=1.27.3
 
 # Setup the base environment. The BUILDPLATFORM is set automatically by Docker.
 # The --platform=${BUILDPLATFORM} flag tells Docker to build the function using