diff --git a/Gemfile b/Gemfile
index 5c7348cf..ee8bfedb 100644
--- a/Gemfile
+++ b/Gemfile
@@ -34,6 +34,6 @@ group :development do
   gem 'netrc', require: false
   gem 'octokit', require: false
   gem 'pry-rescue'
-  gem 'rubocop'
+  gem 'rubocop', require: false
   gem 'yard', require: false
 end
diff --git a/lib/listen/logger.rb b/lib/listen/logger.rb
index 9689252e..0bb98067 100644
--- a/lib/listen/logger.rb
+++ b/lib/listen/logger.rb
@@ -46,7 +46,7 @@ def default_logger
 
       ::Logger.new(STDERR, level: level)
     end
-    
+
     def adapter_warn_behavior_callback(message)
       if adapter_warn_behavior.respond_to?(:call)
         case behavior = adapter_warn_behavior.call(message)
diff --git a/lib/listen/silencer.rb b/lib/listen/silencer.rb
index 4e99b45e..3cc7936c 100644
--- a/lib/listen/silencer.rb
+++ b/lib/listen/silencer.rb
@@ -75,7 +75,7 @@ def configure(options)
     end
 
     def silenced?(relative_path, type)
-      path = relative_path.to_s   # in case it is a Pathname
+      path = relative_path.to_s # in case it is a Pathname
 
       _ignore?(path) || (only_patterns && type == :file && !_only?(path))
     end
diff --git a/spec/lib/listen/logger_spec.rb b/spec/lib/listen/logger_spec.rb
index 3dfd472b..dd8e3525 100644
--- a/spec/lib/listen/logger_spec.rb
+++ b/spec/lib/listen/logger_spec.rb
@@ -197,7 +197,7 @@
       end
 
       [false, nil].each do |behavior|
-        context 'when the message matches a #{behavior} pattern' do
+        context "when the message matches a #{behavior} pattern" do
           let(:message) { "USE #{behavior.inspect}" }
           it 'respects :silent' do
             expect(Listen).not_to receive(:warn).with(message)
diff --git a/spec/lib/listen/record_spec.rb b/spec/lib/listen/record_spec.rb
index b33362b2..4f2a6926 100644
--- a/spec/lib/listen/record_spec.rb
+++ b/spec/lib/listen/record_spec.rb
@@ -14,7 +14,7 @@ def dir_entries_for(hash)
 
   def real_directory(hash)
     dir_entries_for(hash)
-    hash.each do |dir, _|
+    hash.each_key do |dir|
       realpath(dir)
     end
   end