diff --git a/rack-cloudflare.gemspec b/rack-cloudflare.gemspec
index 76071aa..1307e02 100644
--- a/rack-cloudflare.gemspec
+++ b/rack-cloudflare.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler', '~> 1.16'
-  spec.add_development_dependency 'rake',    '~> 10.0'
+  spec.add_development_dependency 'rake',    '~> 13.0'
   spec.add_development_dependency 'rspec',   '~> 3.0'
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'rubycritic'