diff --git a/Gemfile b/Gemfile
index a3bcda2..7db75d4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,5 @@
 source 'https://rubygems.org'
+ruby '2.2.3'
 
 gem 'rake', '10.5.0'
 gem 'rspec', '3.4.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 8160334..2bc74b2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -21,8 +21,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rake
-  rspec
+  rake (= 10.5.0)
+  rspec (= 3.4.0)
 
 BUNDLED WITH
    1.11.2