diff --git a/lib/jekyll/commands/build.rb b/lib/jekyll/commands/build.rb
index cf6d7ea0..d505e2fb 100644
--- a/lib/jekyll/commands/build.rb
+++ b/lib/jekyll/commands/build.rb
@@ -65,7 +65,7 @@ module Jekyll
         # options - A Hash of options passed to the command
         #
         # Returns nothing.
-        def watch(site, options)
+        def watch(_site, options)
           External.require_with_graceful_fail 'jekyll-watch'
           Jekyll::Watcher.watch(options)
         end
diff --git a/lib/jekyll/commands/doctor.rb b/lib/jekyll/commands/doctor.rb
index 32600741..c6ba4fd4 100644
--- a/lib/jekyll/commands/doctor.rb
+++ b/lib/jekyll/commands/doctor.rb
@@ -58,7 +58,7 @@ module Jekyll
           conflicting_urls
         end
 
-        def fsnotify_buggy?(site)
+        def fsnotify_buggy?(_site)
           return true unless Utils::Platforms.osx?
           if Dir.pwd != `pwd`.strip
             Jekyll.logger.error "  " + <<-STR.strip.gsub(/\n\s+/, "\n  ")
diff --git a/lib/jekyll/commands/serve/servlet.rb b/lib/jekyll/commands/serve/servlet.rb
index 7930eb61..cf495216 100644
--- a/lib/jekyll/commands/serve/servlet.rb
+++ b/lib/jekyll/commands/serve/servlet.rb
@@ -37,7 +37,7 @@ module Jekyll
         #
 
         private
-        def validate_and_ensure_charset(req, res)
+        def validate_and_ensure_charset(_req, res)
           key = res.header.keys.grep(/content-type/i).first
           typ = res.header[key]
 
diff --git a/lib/jekyll/configuration.rb b/lib/jekyll/configuration.rb
index 353e437a..0229e073 100644
--- a/lib/jekyll/configuration.rb
+++ b/lib/jekyll/configuration.rb
@@ -282,7 +282,7 @@ module Jekyll
       config
     end
 
-    def renamed_key(old, new, config, allowed_values = nil)
+    def renamed_key(old, new, config, _ = nil)
       if config.key?(old)
         Jekyll::Deprecator.deprecation_message "The '#{old}' configuration" \
           "option has been renamed to '#{new}'. Please update your config " \
diff --git a/lib/jekyll/converters/identity.rb b/lib/jekyll/converters/identity.rb
index 69171b00..9574769d 100644
--- a/lib/jekyll/converters/identity.rb
+++ b/lib/jekyll/converters/identity.rb
@@ -5,7 +5,7 @@ module Jekyll
 
       priority :lowest
 
-      def matches(ext)
+      def matches(_ext)
         true
       end
 
diff --git a/lib/jekyll/converters/markdown.rb b/lib/jekyll/converters/markdown.rb
index 07675427..e6efabf5 100644
--- a/lib/jekyll/converters/markdown.rb
+++ b/lib/jekyll/converters/markdown.rb
@@ -56,7 +56,7 @@ module Jekyll
         extname_list.include?(ext.downcase)
       end
 
-      def output_ext(ext)
+      def output_ext(_ext)
         ".html"
       end
 
diff --git a/lib/jekyll/converters/markdown/redcarpet_parser.rb b/lib/jekyll/converters/markdown/redcarpet_parser.rb
index 64e69ecc..fd1b0461 100644
--- a/lib/jekyll/converters/markdown/redcarpet_parser.rb
+++ b/lib/jekyll/converters/markdown/redcarpet_parser.rb
@@ -47,7 +47,7 @@ module Jekyll
           end
 
           protected
-          def rouge_formatter(lexer)
+          def rouge_formatter(_lexer)
             Rouge::Formatters::HTML.new(:wrap => false)
           end
         end
diff --git a/lib/jekyll/reader.rb b/lib/jekyll/reader.rb
index bc72c657..2926971b 100644
--- a/lib/jekyll/reader.rb
+++ b/lib/jekyll/reader.rb
@@ -67,7 +67,7 @@ module Jekyll
     # dot_dirs - The Array of subdirectories in the dir.
     #
     # Returns nothing.
-    def retrieve_dirs(base, dir, dot_dirs)
+    def retrieve_dirs(_base, dir, dot_dirs)
       dot_dirs.map { |file|
         dir_path = site.in_source_dir(dir, file)
         rel_path = File.join(dir, file)