diff --git a/middleman-core/middleman-core.gemspec b/middleman-core/middleman-core.gemspec
index c0640fcf..ae6b4366 100644
--- a/middleman-core/middleman-core.gemspec
+++ b/middleman-core/middleman-core.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   
   # Core
   s.add_dependency("bundler", ["~> 1.1"])
-  s.add_dependency("rack", ["~> 1.4.1"])
+  s.add_dependency("rack", ["1.4.1"])
   s.add_dependency("tilt", ["~> 1.3.1"])
   
   # Builder