diff --git a/Dockerfile b/Dockerfile
index 909a48c..736b147 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 # Build
-FROM golang:1.11-stretch AS build
+FROM golang:1.12-stretch AS build
 WORKDIR /go/src/github.com/mpolden/echoip
 COPY . .
 ENV GO111MODULE=on CGO_ENABLED=0
diff --git a/go.mod b/go.mod
index 5d6095a..2d40e34 100644
--- a/go.mod
+++ b/go.mod
@@ -1,5 +1,5 @@
 // +heroku install ./...
-// +heroku goVersion go1.11
+// +heroku goVersion go1.12
 module github.com/mpolden/echoip
 
 require (