diff --git a/buttslock/Dockerfile b/buttslock/Dockerfile
index 263ea87..7f0b36d 100644
--- a/buttslock/Dockerfile
+++ b/buttslock/Dockerfile
@@ -8,7 +8,8 @@
 # - /var/run/dbus, the X11 socket (typically /tmp/.X11-unix)
 # And it also requires the USER and DISPLAY environment variables to be set.
 #
-FROM alpine
+FROM alpine:latest
+
 RUN apk --no-cache add \
 	i3lock \
 	imagemagick \
diff --git a/camlistore/Dockerfile b/camlistore/Dockerfile
index 198cd6e..1fc8af1 100644
--- a/camlistore/Dockerfile
+++ b/camlistore/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:latest
 MAINTAINER Jessica Frazelle <jess@docker.com>
 
 ENV PATH /go/bin:/usr/local/go/bin:$PATH
@@ -7,6 +7,8 @@ ENV GOPATH /go
 RUN	apk --no-cache add \
 	ca-certificates
 
+ENV CAMLISTORE_VERSION 0.9
+
 RUN buildDeps=' \
 		go \
 		git \
@@ -18,7 +20,7 @@ RUN buildDeps=' \
 	&& apk --no-cache add $buildDeps \
 	&& mkdir -p /go/src/camlistore.googlesource.com \
 	&& cd /go/src/camlistore.googlesource.com \
-	&& git clone --depth 1 -b 0.9 https://camlistore.googlesource.com/camlistore.git \
+	&& git clone --depth 1 -b "${CAMLISTORE_VERSION}" https://camlistore.googlesource.com/camlistore.git \
 	&& cd /go/src/camlistore.googlesource.com/camlistore \
 	&& go run make.go \
 	&& cp -r ./bin/* /usr/local/bin/ \
diff --git a/cpuminer/Dockerfile b/cpuminer/Dockerfile
index b9f642f..38702a0 100644
--- a/cpuminer/Dockerfile
+++ b/cpuminer/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine
+FROM alpine:latest
 MAINTAINER Jessica Frazelle <jess@docker.com>
 
 RUN apk add --no-cache \
diff --git a/imagemin/Dockerfile b/imagemin/Dockerfile
index 8092bb4..8babc0a 100644
--- a/imagemin/Dockerfile
+++ b/imagemin/Dockerfile
@@ -6,7 +6,7 @@
 #	--entrypoint bash \
 #	jess/imagemin
 #
-FROM alpine
+FROM alpine:latest
 MAINTAINER Jessica Frazelle <jess@docker.com>
 
 RUN apk --no-cache add \
diff --git a/irssi/Dockerfile b/irssi/Dockerfile
index ec8c36a..c243033 100644
--- a/irssi/Dockerfile
+++ b/irssi/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.3
+FROM alpine:latest
 
 RUN apk --no-cache add \
 	ca-certificates
diff --git a/ykpersonalize/Dockerfile b/ykpersonalize/Dockerfile
index 475c20b..297f553 100644
--- a/ykpersonalize/Dockerfile
+++ b/ykpersonalize/Dockerfile
@@ -6,7 +6,7 @@
 #	--name ykpersonalize \
 #	jess/ykpersonalize
 #
-FROM ubuntu
+FROM ubuntu:16.04
 MAINTAINER Jessica Frazelle <jess@docker.com>
 
 RUN apt-get update && apt-get install -y \