diff --git a/kookie/challenge/Gemfile.lock b/kookie/challenge/Gemfile.lock
index 8a58cfc..a2ebbc7 100644
--- a/kookie/challenge/Gemfile.lock
+++ b/kookie/challenge/Gemfile.lock
@@ -23,7 +23,7 @@ GEM
     rack (2.0.6)
     rack-protection (2.0.5)
       rack
-    rake (10.5.0)
+    rake (12.3.3)
     simplecov (0.14.1)
       docile (~> 1.1.0)
       json (>= 1.8, < 3)
@@ -56,7 +56,7 @@ PLATFORMS
 DEPENDENCIES
   bundler (~> 1.11)
   challenge!
-  rake (~> 10.0)
+  rake (~> 12.3)
   simplecov (~> 0.14.1)
   test-unit (~> 3.2.8)
 
diff --git a/kookie/challenge/challenge.gemspec b/kookie/challenge/challenge.gemspec
index 18cf56d..8dfbe10 100644
--- a/kookie/challenge/challenge.gemspec
+++ b/kookie/challenge/challenge.gemspec
@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_development_dependency 'bundler',   '~> 1.11'
-  spec.add_development_dependency 'rake',      '~> 10.0'
+  spec.add_development_dependency 'rake',      '~> 12.3'
   spec.add_development_dependency 'simplecov', '~> 0.14.1'
   spec.add_development_dependency 'test-unit', '~> 3.2.8'