diff --git a/Gemfile.lock b/Gemfile.lock
index 99d05e5..85df8e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -12,7 +12,7 @@ GEM
       ast (~> 2.2)
     powerpack (0.1.1)
     rainbow (2.2.1)
-    rake (10.3.2)
+    rake (12.3.3)
     rspec (3.1.0)
       rspec-core (~> 3.1.0)
       rspec-expectations (~> 3.1.0)
@@ -39,7 +39,7 @@ PLATFORMS
 
 DEPENDENCIES
   bundler (~> 1.6)
-  rake (~> 10.0)
+  rake (~> 12.3)
   rspec (~> 3.0)
   rubocop (~> 0.48)
   ziffern!
diff --git a/ziffern.gemspec b/ziffern.gemspec
index 1d1785b..da4f204 100644
--- a/ziffern.gemspec
+++ b/ziffern.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |gem|
   gem.require_paths = ["."]
 
   gem.add_development_dependency "bundler", "~> 1.6"
-  gem.add_development_dependency "rake", "~> 10.0"
+  gem.add_development_dependency "rake", "~> 12.3"
   gem.add_development_dependency "rspec", "~> 3.0"
   gem.add_development_dependency "rubocop", "~> 0.48"
 end