diff --git a/Gemfile.lock b/Gemfile.lock
index 781a283..711d0b5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -15,7 +15,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2019.0331)
     multi_xml (0.6.0)
-    rake (10.5.0)
+    rake (13.0.1)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)
       rspec-expectations (~> 3.8.0)
@@ -36,7 +36,7 @@ PLATFORMS
 DEPENDENCIES
   bundler (~> 1.16)
   mixmax!
-  rake (~> 10.0)
+  rake (~> 13.0)
   rspec (~> 3.0)
 
 BUNDLED WITH
diff --git a/mixmax.gemspec b/mixmax.gemspec
index 1b99b24..e9390f6 100644
--- a/mixmax.gemspec
+++ b/mixmax.gemspec
@@ -20,7 +20,7 @@ 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_dependency "httparty", "~> 0.16.4"