diff --git a/Dockerfile b/Dockerfile
index a23a1c5..5dd7dd5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,19 +1,21 @@
 FROM golang:alpine as builder
 
-ADD . /go/src/github.com/Luzifer/go-holidays
-WORKDIR /go/src/github.com/Luzifer/go-holidays
+COPY . /go/src/github.com/Luzifer/go-holidays
+WORKDIR /go/src/github.com/Luzifer/go-holidays/cmd/holiday-api
 
 RUN set -ex \
  && apk add --update git \
- && go install -ldflags "-X main.version=$(git describe --tags || git rev-parse --short HEAD || echo dev)" \
-      github.com/Luzifer/go-holidays/cmd/holiday-api
+ && go install \
+      -ldflags "-X main.version=$(git describe --tags --always || echo dev)" \
+      -mod=readonly
 
 FROM alpine:latest
 
 LABEL maintainer "Knut Ahlers <knut@ahlers.me>"
 
 RUN set -ex \
- && apk --no-cache add ca-certificates
+ && apk --no-cache add \
+      ca-certificates
 
 COPY --from=builder /go/bin/holiday-api /usr/local/bin/