diff --git a/alpine/Dockerfile b/alpine/Dockerfile
index 4aaa472..fd73670 100644
--- a/alpine/Dockerfile
+++ b/alpine/Dockerfile
@@ -1,4 +1,4 @@
-FROM alpine:3.5
+FROM alpine:3.6
 
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN adduser -D memcache
@@ -20,6 +20,7 @@ RUN set -x \
 		linux-headers \
 		make \
 		perl \
+		perl-utils \
 		tar \
 	\
 	&& wget -O memcached.tar.gz "https://memcached.org/files/memcached-$MEMCACHED_VERSION.tar.gz" \
diff --git a/debian/Dockerfile b/debian/Dockerfile
index 8649130..aaae8cc 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -1,4 +1,4 @@
-FROM debian:jessie-slim
+FROM debian:stretch-slim
 
 # add our user and group first to make sure their IDs get assigned consistently, regardless of whatever dependencies get added
 RUN groupadd -r memcache && useradd -r -g memcache memcache