diff --git a/ixbrl.gemspec b/ixbrl.gemspec
index a58d937..7f5f770 100644
--- a/ixbrl.gemspec
+++ b/ixbrl.gemspec
@@ -34,6 +34,6 @@ Gem::Specification.new do |spec|
   spec.add_runtime_dependency 'parallel'
 
   spec.add_development_dependency "bundler", "~> 1.13"
-  spec.add_development_dependency "rake", "~> 12.3"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.0"
 end