diff --git a/john/Dockerfile b/john/Dockerfile
index 59ab89c..9404bb9 100644
--- a/john/Dockerfile
+++ b/john/Dockerfile
@@ -2,7 +2,9 @@ FROM alpine:latest
 LABEL maintainer "Jessie Frazelle <jess@linux.com>"
 
 RUN apk add --no-cache \
-	ca-certificates
+	ca-certificates \
+	gmp \
+	libgomp
 
 RUN set -x \
 	&& apk add --no-cache --virtual .build-deps \
diff --git a/runc-rootless/Dockerfile b/runc-rootless/Dockerfile
index de6d4f6..4d8aa90 100644
--- a/runc-rootless/Dockerfile
+++ b/runc-rootless/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.9-alpine AS runc
+FROM golang:alpine AS runc
 ENV RUNC_VERSION 9f9c96235cc97674e935002fc3d78361b696a69e
 RUN apk add --no-cache \
 	bash \