diff --git a/bin/jekyll b/bin/jekyll
index 297e1175..173a58d3 100755
--- a/bin/jekyll
+++ b/bin/jekyll
@@ -28,7 +28,7 @@ Mercenary.program(:jekyll) do |p|
 
   Jekyll::Command.subclasses.each { |c| c.init_with_program(p) }
 
-  p.action do |args, options|
+  p.action do |args, _|
     if args.empty?
       Jekyll.logger.error "A subcommand is required."
       puts p
diff --git a/lib/jekyll/commands/build.rb b/lib/jekyll/commands/build.rb
index b75194ef..cf6d7ea0 100644
--- a/lib/jekyll/commands/build.rb
+++ b/lib/jekyll/commands/build.rb
@@ -11,7 +11,7 @@ module Jekyll
 
             add_build_options(c)
 
-            c.action do |args, options|
+            c.action do |_, options|
               options["serving"] = false
               Jekyll::Commands::Build.process(options)
             end
diff --git a/lib/jekyll/commands/clean.rb b/lib/jekyll/commands/clean.rb
index b7f9a953..371b7043 100644
--- a/lib/jekyll/commands/clean.rb
+++ b/lib/jekyll/commands/clean.rb
@@ -9,7 +9,7 @@ module Jekyll
 
             add_build_options(c)
 
-            c.action do |args, options|
+            c.action do |_, options|
               Jekyll::Commands::Clean.process(options)
             end
           end
diff --git a/lib/jekyll/commands/doctor.rb b/lib/jekyll/commands/doctor.rb
index 42bb0110..32600741 100644
--- a/lib/jekyll/commands/doctor.rb
+++ b/lib/jekyll/commands/doctor.rb
@@ -10,7 +10,7 @@ module Jekyll
 
             c.option '--config CONFIG_FILE[,CONFIG_FILE2,...]', Array, 'Custom configuration file'
 
-            c.action do |args, options|
+            c.action do |_, options|
               Jekyll::Commands::Doctor.process(options)
             end
           end
diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index 9e588ded..5b8c9044 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -32,7 +32,7 @@ module Jekyll
         categories_from_path(collection.relative_directory)
       end
 
-      data.default_proc = proc do |hash, key|
+      data.default_proc = proc do |_, key|
         site.frontmatter_defaults.find(relative_path, collection.label, key)
       end
 
diff --git a/lib/jekyll/drops/drop.rb b/lib/jekyll/drops/drop.rb
index 2ad107e8..c194a5ba 100644
--- a/lib/jekyll/drops/drop.rb
+++ b/lib/jekyll/drops/drop.rb
@@ -114,7 +114,7 @@ module Jekyll
       #
       # Returns a Hash with all the keys and values resolved.
       def to_h
-        keys.each_with_object({}) do |(key, val), result|
+        keys.each_with_object({}) do |(key, _), result|
           result[key] = self[key]
         end
       end
diff --git a/lib/jekyll/liquid_renderer.rb b/lib/jekyll/liquid_renderer.rb
index 0edeb44b..70f7b0d1 100644
--- a/lib/jekyll/liquid_renderer.rb
+++ b/lib/jekyll/liquid_renderer.rb
@@ -15,7 +15,7 @@ module Jekyll
     def file(filename)
       filename = @site.in_source_dir(filename).sub(/\A#{Regexp.escape(@site.source)}\//, '')
 
-      LiquidRenderer::File.new(self, filename).tap do |file|
+      LiquidRenderer::File.new(self, filename).tap do
         @stats[filename] ||= {}
         @stats[filename][:count] ||= 0
         @stats[filename][:count] += 1
diff --git a/lib/jekyll/liquid_renderer/table.rb b/lib/jekyll/liquid_renderer/table.rb
index 74ec6066..e3e0c8af 100644
--- a/lib/jekyll/liquid_renderer/table.rb
+++ b/lib/jekyll/liquid_renderer/table.rb
@@ -69,7 +69,7 @@ module Jekyll
     end
 
     def data_for_table(n)
-      sorted = @stats.sort_by { |filename, file_stats| -file_stats[:time] }
+      sorted = @stats.sort_by { |_, file_stats| -file_stats[:time] }
       sorted = sorted.slice(0, n)
 
       table = [%w(Filename Count Bytes Time)]
diff --git a/lib/jekyll/page.rb b/lib/jekyll/page.rb
index fb46f324..aaf472cf 100644
--- a/lib/jekyll/page.rb
+++ b/lib/jekyll/page.rb
@@ -41,7 +41,7 @@ module Jekyll
       process(name)
       read_yaml(File.join(base, dir), name)
 
-      data.default_proc = proc do |hash, key|
+      data.default_proc = proc do |_, key|
         site.frontmatter_defaults.find(File.join(dir, name), type, key)
       end
 
diff --git a/lib/jekyll/site.rb b/lib/jekyll/site.rb
index 2859355c..3ed60c12 100644
--- a/lib/jekyll/site.rb
+++ b/lib/jekyll/site.rb
@@ -165,7 +165,7 @@ module Jekyll
 
       Jekyll::Hooks.trigger :site, :pre_render, self, payload
 
-      collections.each do |label, collection|
+      collections.each do |_, collection|
         collection.docs.each do |document|
           if regenerator.regenerate?(document)
             document.output = Jekyll::Renderer.new(self, document, payload).run
diff --git a/lib/jekyll/stevenson.rb b/lib/jekyll/stevenson.rb
index ea26c8b5..d6dd5434 100644
--- a/lib/jekyll/stevenson.rb
+++ b/lib/jekyll/stevenson.rb
@@ -5,7 +5,7 @@ module Jekyll
       @level = DEBUG
       @default_formatter = Formatter.new
       @logdev = $stdout
-      @formatter = proc do |severity, datetime, progname, msg|
+      @formatter = proc do |_, _, _, msg|
         "#{msg}"
       end
     end