bootstrap.sh in achecker-0.0.4 vs bootstrap.sh in achecker-0.0.5

@@ -19,10 +19,10 @@
   apt-get install -y zlib1g-dev
 }
 
 function install_ruby {
   echo "Installing ruby..."
-  apt-get install -y ruby2.1 ruby2.1-dev
+  apt-get install -y ruby2.5 ruby2.5-dev
   gem install bundler
   echo "Done installing ruby."
 }
 
 update_apt_repositories