diff --git a/Dockerfile b/Dockerfile
index 1c42f5d..45e4311 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:alpine as builder
+FROM golang:1.8-alpine as builder
 ADD . /go/src/github.com/jimeh/casecmp
 WORKDIR /go/src/github.com/jimeh/casecmp
 RUN CGO_ENABLED=0 go build -a -o /casecmp \