diff --git a/calligraphy.gemspec b/calligraphy.gemspec
index fb55543..6f93e9f 100644
--- a/calligraphy.gemspec
+++ b/calligraphy.gemspec
@@ -16,5 +16,5 @@ Gem::Specification.new do |s|
   s.files       = Dir['lib/**/*', 'LICENSE', 'README.md']
   s.test_files  = Dir['spec/**/*']
 
-  s.add_dependency 'rails', '>= 5.0'
+  s.add_dependency 'rails', '~> 5.0'
 end