diff --git a/Dockerfile b/Dockerfile
index f0e43c62..e314aaee 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,15 +3,12 @@ FROM alpine:3.3
 ENV GOPATH /go
 
 RUN apk update && apk add ca-certificates go git && \
-    rm -rf /var/cache/apk/*
-
-COPY . /go/src/github.com/xenolf/lego
-
-RUN cd /go/src/github.com/xenolf/lego && \
-	go get ./... && \
-	go build -o /usr/bin/lego . && \
-	apk del ca-certificates go git && \
-	rm -rf /var/cache/apk/* && \
-	rm -rf /go
+    rm -rf /var/cache/apk/* && \
+    go get -u github.com/xenolf/lego && \
+    cd /go/src/github.com/xenolf/lego && \
+    go build -o /usr/bin/lego . && \
+    apk del ca-certificates go git && \
+    rm -rf /var/cache/apk/* && \
+    rm -rf /go
 
 ENTRYPOINT [ "/usr/bin/lego" ]