diff --git a/Dockerfile b/Dockerfile
index 1c46757..bca9981 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -29,14 +29,18 @@ RUN apt-get update --yes && \
     libjpeg-dev \
     libfftw3-dev \
     automake \
+    ruby-dev \
     wget && \
     apt-get clean && rm -rf /var/lib/apt/lists/* 
 
 ADD Rprofile.site /usr/lib/R/etc
 
-
-
 USER jenkins
 
 RUN tlmgr init-usertree && \
     tlmgr option repository ftp://tug.org/historic/systems/texlive/2020/tlnet-final 
+
+ENV GEM_HOME=/home/jenkins/gems
+ENV PATH=/home/jenkins/gems/bin:$PATH
+
+RUN gem install jekyll bundler