diff --git a/Gemfile b/Gemfile
index e27db9331..7a5628bfa 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,5 +1,5 @@
 source 'https://rubygems.org'
-ruby '2.4.0'
+ruby '~>2.4.0'
 
 
 # case RUBY_PLATFORM