diff --git a/cookiejar.gemspec b/cookiejar.gemspec
index 1c58a00..f12de95 100644
--- a/cookiejar.gemspec
+++ b/cookiejar.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
   s.rdoc_options  = ['--title', 'CookieJar -- Client-side HTTP Cookies']
   s.require_paths = ['lib']
 
-  s.add_development_dependency 'rake', '>= 10.0', '< 13'
+  s.add_development_dependency 'rake', '>= 10.0', '< 14'
   s.add_development_dependency 'rspec-collection_matchers', '~> 1.0'
   s.add_development_dependency 'rspec', '~> 3.0'
   s.add_development_dependency 'yard',  '~> 0.9.20'