diff --git a/Gemfile b/Gemfile
index cc6884d..28cb530 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@
 
 # Gemfile
 
-ruby "~> #{File.read('.ruby-version', mode: 'rb').chomp}"
+ruby "~> #{File.read(File.join(File.dirname(__FILE__), '.ruby-version'), mode: 'rb').chomp}"
 
 source 'https://rubygems.org'