diff --git a/docker/ddns/Dockerfile b/docker/ddns/Dockerfile
index d15d6cb..8105f09 100644
--- a/docker/ddns/Dockerfile
+++ b/docker/ddns/Dockerfile
@@ -1,4 +1,6 @@
-FROM golang:1.9
+FROM golang:1.9-alpine3.7
+
+RUN apk add --no-cache git
 
 WORKDIR /go/src/github.com/pboehm/ddns
 COPY . .
diff --git a/docker/powerdns/Dockerfile b/docker/powerdns/Dockerfile
index e560109..48777e1 100644
--- a/docker/powerdns/Dockerfile
+++ b/docker/powerdns/Dockerfile
@@ -1,5 +1,4 @@
 FROM buildpack-deps:jessie-scm
-MAINTAINER Philipp Böhm <philipp@pboehm.org>
 
 # the setup procedure according to https://repo.powerdns.com/ (Debian 8 Jessie)
 RUN echo "deb http://repo.powerdns.com/debian jessie-auth-41 main" > /etc/apt/sources.list.d/pdns.list \