diff --git a/Gemfile b/Gemfile
index 1d0293f3..13e8f5d9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,5 +10,5 @@ group :uart do
 end
 
 group :development do
-    gem 'rubocop', '>= 1.2.0', require: false
+    gem 'rubocop', '>= 1.3.0', require: false
 end
diff --git a/utils/devtool.rb b/utils/devtool.rb
index fed35763..d104f31c 100755
--- a/utils/devtool.rb
+++ b/utils/devtool.rb
@@ -273,7 +273,7 @@ class DevTool
     def copyright_source_files
         extensions = ['.S', '.rs', '.rb']
 
-        # Note: The selection result is the return value of the function.
+        # NOTE: The selection result is the return value of the function.
         tracked_files.select do |f|
             next unless File.exist?(f)
             next if f.include?('build.rs')