Gemfile in rbnacl-6.0.1 vs Gemfile in rbnacl-7.0.0

@@ -9,10 +9,10 @@
 end
 
 group :test do
   gem "coveralls", require: false
   gem "rspec"
-  gem "rubocop", "= 0.60.0"
+  gem "rubocop", "= 0.70.0"
 end
 
 group :development, :test do
   gem "rake"
 end