diff --git a/rack-tracker.gemspec b/rack-tracker.gemspec
index ce83c4d..e165fcb 100644
--- a/rack-tracker.gemspec
+++ b/rack-tracker.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency "rack", "~> 1.5.2"
+  spec.add_dependency "rack", ">= 1.5.2"
   spec.add_dependency "tilt", "~> 1.4.1"
   spec.add_dependency "activesupport", ">= 4.0.0"