diff --git a/.travis.yml b/.travis.yml
index 5681b56..e468b5b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -32,7 +32,7 @@ install:
   - pandoc --version
 
   # Install ruby gems
-  - bundle install --jobs=3 --retry=3
+  - bundle install --jobs=3 --retry=3 --deployment
 
   # Install R packages
   - mkdir -p "$R_LIBS_USER"