diff --git a/.travis.yml b/.travis.yml
index 2c47a5e..ef787d5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -18,7 +18,8 @@ install:
   - rm pandoc-1.12.3.zip
 
   # Install jekyll
-  - travis_retry gem install jekyll mime-types
+  - travis_retry gem install mime-types
+  - travis_retry gem install jekyll -v 2.5.3
 
   # Install R packages
   - ./travis-tool.sh r_binary_install knitr png