diff --git a/pry.gemspec b/pry.gemspec
index 54b92818..f03a500a 100644
--- a/pry.gemspec
+++ b/pry.gemspec
@@ -28,5 +28,5 @@ Gem::Specification.new do |s|
   s.files         = `git ls-files bin lib *.md LICENSE`.split("\n")
 
   s.add_dependency 'coderay',       '~> 1.1.0'
-  s.add_dependency 'method_source', '>= 0.9.1'
+  s.add_dependency 'method_source', '~> 0.9.0'
 end