diff --git a/bin/mutant b/bin/mutant
index 9c114ccb..48711550 100755
--- a/bin/mutant
+++ b/bin/mutant
@@ -1,5 +1,4 @@
 #!/usr/bin/env ruby
-# encoding: utf-8
 
 trap('INT') do |status|
   exit! 128 + status
diff --git a/lib/mutant/integration/rspec.rb b/lib/mutant/integration/rspec.rb
index aee71a37..22d90a93 100644
--- a/lib/mutant/integration/rspec.rb
+++ b/lib/mutant/integration/rspec.rb
@@ -1,4 +1,3 @@
-# encoding: UTF-8
 require 'rspec/core'
 require 'rspec/core/formatters/base_text_formatter'
 
diff --git a/lib/mutant/meta/example.rb b/lib/mutant/meta/example.rb
index cc0b9362..3dab2f31 100644
--- a/lib/mutant/meta/example.rb
+++ b/lib/mutant/meta/example.rb
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 module Mutant
   module Meta
     class Example
diff --git a/lib/mutant/mutator/node/resbody.rb b/lib/mutant/mutator/node/resbody.rb
index 9c37ef73..811761d0 100644
--- a/lib/mutant/mutator/node/resbody.rb
+++ b/lib/mutant/mutator/node/resbody.rb
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 module Mutant
   class Mutator
     class Node
diff --git a/lib/mutant/mutator/node/send/index.rb b/lib/mutant/mutator/node/send/index.rb
index 5fbc6cc0..b6dd9fea 100644
--- a/lib/mutant/mutator/node/send/index.rb
+++ b/lib/mutant/mutator/node/send/index.rb
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 module Mutant
   class Mutator
     class Node
diff --git a/lib/mutant/warning_filter.rb b/lib/mutant/warning_filter.rb
index 09315195..bb7905db 100644
--- a/lib/mutant/warning_filter.rb
+++ b/lib/mutant/warning_filter.rb
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 module Mutant
   # Stream filter for warnings
   class WarningFilter
diff --git a/spec/support/mutation_verifier.rb b/spec/support/mutation_verifier.rb
index e63294ad..00b2b74f 100644
--- a/spec/support/mutation_verifier.rb
+++ b/spec/support/mutation_verifier.rb
@@ -1,5 +1,3 @@
-# encoding: UTF-8
-
 class MutationVerifier
   include Adamantium::Flat, Concord.new(:original_node, :expected, :generated)