diff --git a/middleman.gemspec b/middleman.gemspec
index f75143d8..f84f38a0 100644
--- a/middleman.gemspec
+++ b/middleman.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ["lib"]
 
-  s.add_runtime_dependency("rack", ["~> 1.1"])
+  s.add_runtime_dependency("rack", ["~> 1.3.0"])
   s.add_runtime_dependency("thor", ["~> 0.14.0"])
   s.add_runtime_dependency("tilt", ["~> 1.3.1"])
   s.add_runtime_dependency("rdiscount", ["~> 1.6.8"])