psd_native.gemspec in psd_native-1.1.2 vs psd_native.gemspec in psd_native-1.1.3

@@ -19,17 +19,17 @@
 
   spec.platform      = Gem::Platform::RUBY
   spec.extensions    = ["ext/psd_native/extconf.rb"]
   spec.require_paths = ["lib", "ext"]
 
-  spec.add_runtime_dependency "psd", ">= 2.1.1"
+  spec.add_runtime_dependency "psd", "~> 2.1.1"
   spec.add_runtime_dependency "oily_png", "~> 1.1"
 
   spec.add_development_dependency "bundler", "~> 1.3"
   spec.add_development_dependency "rake"
   spec.add_development_dependency "rake-compiler", "~> 0.9"
 
   spec.test_files = Dir.glob("spec/**/*")
   spec.add_development_dependency 'rspec', "~> 2.14"
   spec.add_development_dependency 'guard'
   spec.add_development_dependency 'guard-rspec'
-end
\ No newline at end of file
+end