diff --git a/Gemfile b/Gemfile
index ec5c419..aeca745 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
-ruby '>=2.3.1'
+ruby '~>2.2.10'
 source 'https://rubygems.org'
 
 # Middleman