diff --git a/john/Dockerfile b/john/Dockerfile
index 6987ada..59ab89c 100644
--- a/john/Dockerfile
+++ b/john/Dockerfile
@@ -1,36 +1,28 @@
-FROM debian:jessie-slim
+FROM alpine:latest
 LABEL maintainer "Jessie Frazelle <jess@linux.com>"
 
-RUN apt-get update && apt-get install -y \
-	libgmp10 \
-	libgomp1 \
-	libkrb5-3 \
-	libnss3 \
-	libssl1.0.0 \
-	openssl \
-	--no-install-recommends \
-	&& rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache \
+	ca-certificates
 
-RUN buildDeps=' \
-		ca-certificates \
+RUN set -x \
+	&& apk add --no-cache --virtual .build-deps \
+		build-base \
 		gcc \
 		git \
-		libgmp-dev \
-		libkrb5-dev \
-		libnss3-dev \
-		libssl-dev \
+		gmp-dev \
+		krb5-dev \
+		libressl-dev \
 		make \
-	' \
-	&& set -x \
-	&& apt-get update && apt-get install -y $buildDeps --no-install-recommends \
-	&& rm -rf /var/lib/apt/lists/* \
+		perl \
 	&& git clone --depth 1 https://github.com/magnumripper/JohnTheRipper.git /usr/src/johntheripper \
-	&& cd /usr/src/johntheripper/src \
-	&& ./configure || cat config.log \
-	&& make \
-	&& cp -r ../run/* /usr/local/bin/ \
+	&& ( \
+		cd /usr/src/johntheripper/src \
+		&& ./configure || cat config.log \
+		&& make \
+		&& cp -r ../run/* /usr/local/bin/ \
+	) \
 	&& rm -rf /usr/src/johntheripper \
-	&& apt-get purge -y --auto-remove $buildDeps
+	&& apk del .build-deps
 
 COPY john.ini /root/john.ini
 COPY passwd.lst /root/passwd.lst
diff --git a/keepassxc/Dockerfile b/keepassxc/Dockerfile
index 7e79f98..e58f165 100644
--- a/keepassxc/Dockerfile
+++ b/keepassxc/Dockerfile
@@ -8,7 +8,7 @@
 #		-e DISPLAY=unix$DISPLAY \
 #		jess/keepassxc
 #
-FROM alpine:edge
+FROM alpine:latest
 LABEL maintainer "Christian Koep <christiankoep@gmail.com>"
 
 ENV KEEPASSXC_VERSION 2.3.4
@@ -31,6 +31,7 @@ RUN buildDeps=' \
 	set -x \
 	&& apk --no-cache add \
 		$buildDeps \
+		--repository https://dl-3.alpinelinux.org/alpine/edge/main \
 	&& git clone --depth 1 --branch ${KEEPASSXC_VERSION} https://github.com/keepassxreboot/keepassxc.git /usr/src/keepassxc \
 	&& cd /usr/src/keepassxc \
 	&& mkdir build \
diff --git a/mutt/Dockerfile b/mutt/Dockerfile
index 12c697d..b6afab3 100644
--- a/mutt/Dockerfile
+++ b/mutt/Dockerfile
@@ -8,7 +8,7 @@
 #	--name mutt \
 #	jess/mutt
 #
-FROM alpine:edge
+FROM alpine:latest
 LABEL maintainer "Jessie Frazelle <jess@linux.com>"
 
 RUN addgroup -g 1000 user \
@@ -22,7 +22,8 @@ RUN apk --no-cache add \
 	lynx \
 	mutt \
 	mutt-doc \
-	vim
+	vim \
+	--repository https://dl-3.alpinelinux.org/alpine/edge/main
 
 # a browser is necessary!
 ENV BROWSER lynx
diff --git a/postfix/Dockerfile b/postfix/Dockerfile
index df8ba0f..054532e 100644
--- a/postfix/Dockerfile
+++ b/postfix/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:edge
+FROM alpine:latest
 
 RUN apk add --no-cache \
 	bash \
@@ -7,7 +7,8 @@ RUN apk add --no-cache \
 	mailx \
 	postfix \
 	rsyslog \
-	runit
+	runit \
+	--repository https://dl-3.alpinelinux.org/alpine/edge/main
 
 COPY service /etc/service
 COPY runit_bootstrap /usr/sbin/runit_bootstrap