diff --git a/Gemfile.lock b/Gemfile.lock
index cb9c5c3..6afb54e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -27,6 +27,8 @@ GEM
       unicode-display_width (>= 1.4.0, < 3.0)
     rubocop-ast (1.24.0)
       parser (>= 3.1.1.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
     ruby-progressbar (1.11.0)
     unicode-display_width (2.3.0)
 
@@ -34,9 +36,9 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bundler (>= 2.2.0)
-  rake
-  rubocop
+  rake (~> 13.0.0)
+  rubocop (~> 1.39.0)
+  rubocop-rake (~> 0.6.0)
   zip-codes!
 
 BUNDLED WITH
diff --git a/Rakefile b/Rakefile
index 3b2b233..8f288ad 100644
--- a/Rakefile
+++ b/Rakefile
@@ -14,7 +14,5 @@ task :convert do
     }
   end
 
-  File.open('lib/data/US.yml', 'w') do |file|
-    file.write codes.to_yaml
-  end
+  File.write('lib/data/US.yml', codes.to_yaml)
 end