diff --git a/Dockerfile b/Dockerfile
index 5d068d1..a8e25d2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM starefossen/ruby-node:2-6-alpine
 
-ENV GITHUB_GEM_VERSION 202
-ENV JSON_GEM_VERSION 1.8.6
+ENV GITHUB_GEM_VERSION 212
+ENV JSON_GEM_VERSION 2.5.1
 
 RUN apk --update add --virtual build_deps \
     build-base ruby-dev libc-dev linux-headers \