diff --git a/installer/install.sh b/installer/install.sh
--- a/installer/install.sh
+++ b/installer/install.sh
@@ -11,7 +11,7 @@
 
 echo "Installing rails"
 
-sudo gem install rails --no-ri --no-rdoc
+sudo gem install rails --no-ri --no-rdoc --version=2.3.8
 
 echo "Fetching Cafe Grader from Git repositories"