diff --git a/Gemfile.lock b/Gemfile.lock
index 8d23dc3..edc9dbc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -79,6 +79,8 @@ GEM
     rubocop-performance (1.21.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
+    rubocop-rake (0.6.0)
+      rubocop (~> 1.0)
     rubocop-rspec (2.31.0)
       rubocop (~> 1.40)
       rubocop-capybara (~> 2.17)
@@ -110,6 +112,7 @@ DEPENDENCIES
   rspec (~> 3.0)
   rubocop (~> 1.0)
   rubocop-performance (~> 1.5)
+  rubocop-rake (~> 0.6.0)
   rubocop-rspec (~> 2.8)
   simplecov (~> 0.16)
   simplecov-cobertura (~> 2.0)
diff --git a/prawn-swiss_qr_bill.gemspec b/prawn-swiss_qr_bill.gemspec
index af59b77..fbf612b 100644
--- a/prawn-swiss_qr_bill.gemspec
+++ b/prawn-swiss_qr_bill.gemspec
@@ -32,6 +32,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'rubocop', '~> 1.0'
   spec.add_development_dependency 'rubocop-performance', '~> 1.5'
   spec.add_development_dependency 'rubocop-rspec', '~> 2.8'
+  spec.add_development_dependency 'rubocop-rake', '~> 0.6.0'
   spec.add_development_dependency 'simplecov', '~> 0.16'
   spec.add_development_dependency 'simplecov-cobertura', '~> 2.0'