diff --git a/.go-version b/.go-version
index 98e863cd..622f042f 100644
--- a/.go-version
+++ b/.go-version
@@ -1 +1 @@
-1.15.8
+1.17.6
diff --git a/Dockerfile b/Dockerfile
index 3e84e4cb..0f530924 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.17.0 AS builder
+FROM golang:1.17.6 AS builder
 ADD . /go/src/github.com/alphagov/router
 WORKDIR /go/src/github.com/alphagov/router
 RUN CGO_ENABLED=0 go build -o router