diff --git a/cyberarm_engine.gemspec b/cyberarm_engine.gemspec
index be77737..cf96af7 100644
--- a/cyberarm_engine.gemspec
+++ b/cyberarm_engine.gemspec
@@ -31,6 +31,6 @@ Gem::Specification.new do |spec|
   spec.add_dependency "gosu", "~> 0.15.0"
 
   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 "minitest", "~> 5.0"
 end