diff --git a/Gemfile b/Gemfile
index 3d5b03a1..9b584f9b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,6 @@
 source 'https://rubygems.org'
 
+ruby '2.3.1'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.0.0', '>= 5.0.0.1'
diff --git a/Gemfile.lock b/Gemfile.lock
index e133b2f5..ba66b8b8 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -233,5 +233,8 @@ DEPENDENCIES
   uglifier (>= 1.3.0)
   web-console
 
+RUBY VERSION
+   ruby 2.3.1p112
+
 BUNDLED WITH
    1.13.5