diff --git a/Dockerfile b/Dockerfile
index 438f678..70e139c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ MAINTAINER Hanjo Meinhardt <hanjo@bunix.de>
 ENV dev_packages="ca-certificates build-base libffi-dev ruby-dev ruby-rdoc ruby-irb gcc make musl-dev"
 
 RUN apk update && apk upgrade \
-    && apk add ruby ruby-json ${dev_packages} \
+    && apk add ruby ruby-json libffi libstdc++ ${dev_packages} \
     && rm -rf /var/cache/apk/*
 
 RUN gem install jekyll -v <VERSION> \