diff --git a/Gemfile b/Gemfile
index 33d1144..9160a6b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,4 +1,4 @@
 source 'https://rubygems.org'
 
-gem 'rake'
+gem 'rake', '>= 12.3.3'
 gem 'rspec'
\ No newline at end of file
diff --git a/Gemfile.lock b/Gemfile.lock
index c16e0c0..4a63fa6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ GEM
   remote: https://rubygems.org/
   specs:
     diff-lcs (1.2.5)
-    rake (10.4.2)
+    rake (13.0.1)
     rspec (3.3.0)
       rspec-core (~> 3.3.0)
       rspec-expectations (~> 3.3.0)
@@ -21,5 +21,8 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rake
+  rake (>= 12.3.3)
   rspec
+
+BUNDLED WITH
+   1.17.3