diff --git a/Gemfile b/Gemfile
index 7f1d99c..d8b5a7a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,7 +4,7 @@ source "https://rubygems.org"
 gemspec
 
 group :development do
-  gem "rake", "~> 12.0"
+  gem "rake", "~> 13.2"
   gem "test-unit"
   gem "test-unit-ruby-core"
 end