diff --git a/Gemfile.lock b/Gemfile.lock
index 8233cc7..3ff547b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -60,7 +60,7 @@ GEM
       pry (~> 0.10)
     psych (3.1.0)
     rainbow (3.0.0)
-    rake (12.3.2)
+    rake (13.0.6)
     rb-fsevent (0.10.3)
     rb-inotify (0.9.10)
       ffi (>= 0.5.0, < 2)
@@ -113,7 +113,7 @@ DEPENDENCIES
   mailinator!
   pry (~> 0.12.2)
   pry-byebug (~> 3.7.0)
-  rake (~> 12.3.1)
+  rake (~> 13.0.6)
   rspec (~> 3.8.0)
   rubocop (~> 0.65.0)
 
diff --git a/mailinator.gemspec b/mailinator.gemspec
index c30e705..f9fd492 100644
--- a/mailinator.gemspec
+++ b/mailinator.gemspec
@@ -21,5 +21,5 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'hashie', '>= 3.5.4', '< 3.7.0'
 
   spec.add_development_dependency 'bundler', '~> 1.16.2'
-  spec.add_development_dependency 'rake', '~> 12.3.1'
+  spec.add_development_dependency 'rake', '~> 13.0.6'
 end