diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 7c0ffe8..53fcffd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -18,14 +18,14 @@ jobs:
       contents: read
       pull-requests: write
       checks: write
-      
+
     steps:
       - uses: actions/checkout@v7
 
       - name: Setup Go
         uses: actions/setup-go@v7
         with:
-          go-version: "1.26"
+          go-version: "1.27"
 
       - name: Cache Go modules & tools
         uses: actions/cache@v6
diff --git a/Dockerfile b/Dockerfile
index 6b9453c..436529f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.26-alpine AS build
+FROM golang:1.27-alpine AS build
 
 RUN apk update && \
     apk add --no-cache ca-certificates tzdata git curl && \
diff --git a/go.mod b/go.mod
index 5356cf7..d130be5 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/map-services/postcode-polygons
 
-go 1.26
+go 1.27
 
 require (
 	github.com/Depado/ginprom v1.8.3