diff --git a/exe/bundle b/exe/bundle
index aaf773745d3..fccece038b3 100755
--- a/exe/bundle
+++ b/exe/bundle
@@ -7,7 +7,7 @@ Signal.trap("INT") do
   exit 1
 end
 
-require "bundler"
+require_relative "../lib/bundler"
 # Check if an older version of bundler is installed
 $LOAD_PATH.each do |path|
   next unless path =~ %r{/bundler-0\.(\d+)} && $1.to_i < 9
@@ -18,9 +18,9 @@ $LOAD_PATH.each do |path|
   abort(err)
 end
 
-require "bundler/friendly_errors"
+require_relative "../lib/bundler/friendly_errors"
 Bundler.with_friendly_errors do
-  require "bundler/cli"
+  require_relative "../lib/bundler/cli"
 
   # Allow any command to use --help flag to show help for that command
   help_flags = %w[--help -h]
diff --git a/lib/bundler.rb b/lib/bundler.rb
index d8f9462c6d7..735750f59d7 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -564,7 +564,7 @@ def reset_rubygems!
   private
 
     def eval_yaml_gemspec(path, contents)
-      Kernel.send(:require, "bundler/psyched_yaml")
+      require_relative "bundler/psyched_yaml"
 
       # If the YAML is invalid, Syck raises an ArgumentError, and Psych
       # raises a Psych::SyntaxError. See psyched_yaml.rb for more info.
diff --git a/lib/bundler/vendor/thor/lib/thor.rb b/lib/bundler/vendor/thor/lib/thor.rb
index 999e8b7e614..6017ee9ad82 100644
--- a/lib/bundler/vendor/thor/lib/thor.rb
+++ b/lib/bundler/vendor/thor/lib/thor.rb
@@ -1,5 +1,5 @@
 require "set"
-require "bundler/vendor/thor/lib/thor/base"
+require_relative "thor/base"
 
 class Bundler::Thor
   class << self
diff --git a/lib/bundler/vendor/thor/lib/thor/actions.rb b/lib/bundler/vendor/thor/lib/thor/actions.rb
index b06feac2a02..5681d5a7c63 100644
--- a/lib/bundler/vendor/thor/lib/thor/actions.rb
+++ b/lib/bundler/vendor/thor/lib/thor/actions.rb
@@ -1,11 +1,11 @@
 require "uri"
-require "bundler/vendor/thor/lib/thor/core_ext/io_binary_read"
-require "bundler/vendor/thor/lib/thor/actions/create_file"
-require "bundler/vendor/thor/lib/thor/actions/create_link"
-require "bundler/vendor/thor/lib/thor/actions/directory"
-require "bundler/vendor/thor/lib/thor/actions/empty_directory"
-require "bundler/vendor/thor/lib/thor/actions/file_manipulation"
-require "bundler/vendor/thor/lib/thor/actions/inject_into_file"
+require_relative "core_ext/io_binary_read"
+require_relative "actions/create_file"
+require_relative "actions/create_link"
+require_relative "actions/directory"
+require_relative "actions/empty_directory"
+require_relative "actions/file_manipulation"
+require_relative "actions/inject_into_file"
 
 class Bundler::Thor
   module Actions
diff --git a/lib/bundler/vendor/thor/lib/thor/actions/create_file.rb b/lib/bundler/vendor/thor/lib/thor/actions/create_file.rb
index 97d22d9bbdd..330fc08caee 100644
--- a/lib/bundler/vendor/thor/lib/thor/actions/create_file.rb
+++ b/lib/bundler/vendor/thor/lib/thor/actions/create_file.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/actions/empty_directory"
+require_relative "empty_directory"
 
 class Bundler::Thor
   module Actions
diff --git a/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb b/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb
index 3a664401b41..70504a2c1fe 100644
--- a/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb
+++ b/lib/bundler/vendor/thor/lib/thor/actions/create_link.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/actions/create_file"
+require_relative "create_file"
 
 class Bundler::Thor
   module Actions
diff --git a/lib/bundler/vendor/thor/lib/thor/actions/directory.rb b/lib/bundler/vendor/thor/lib/thor/actions/directory.rb
index f555f7b7e0f..03c97bf630f 100644
--- a/lib/bundler/vendor/thor/lib/thor/actions/directory.rb
+++ b/lib/bundler/vendor/thor/lib/thor/actions/directory.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/actions/empty_directory"
+require_relative "empty_directory"
 
 class Bundler::Thor
   module Actions
diff --git a/lib/bundler/vendor/thor/lib/thor/actions/inject_into_file.rb b/lib/bundler/vendor/thor/lib/thor/actions/inject_into_file.rb
index 349b26ff65c..cf651a4e78d 100644
--- a/lib/bundler/vendor/thor/lib/thor/actions/inject_into_file.rb
+++ b/lib/bundler/vendor/thor/lib/thor/actions/inject_into_file.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/actions/empty_directory"
+require_relative "empty_directory"
 
 class Bundler::Thor
   module Actions
diff --git a/lib/bundler/vendor/thor/lib/thor/base.rb b/lib/bundler/vendor/thor/lib/thor/base.rb
index f55b14fbfcd..7d7cd3b5fe1 100644
--- a/lib/bundler/vendor/thor/lib/thor/base.rb
+++ b/lib/bundler/vendor/thor/lib/thor/base.rb
@@ -1,12 +1,12 @@
-require "bundler/vendor/thor/lib/thor/command"
-require "bundler/vendor/thor/lib/thor/core_ext/hash_with_indifferent_access"
-require "bundler/vendor/thor/lib/thor/core_ext/ordered_hash"
-require "bundler/vendor/thor/lib/thor/error"
-require "bundler/vendor/thor/lib/thor/invocation"
-require "bundler/vendor/thor/lib/thor/parser"
-require "bundler/vendor/thor/lib/thor/shell"
-require "bundler/vendor/thor/lib/thor/line_editor"
-require "bundler/vendor/thor/lib/thor/util"
+require_relative "command"
+require_relative "core_ext/hash_with_indifferent_access"
+require_relative "core_ext/ordered_hash"
+require_relative "error"
+require_relative "invocation"
+require_relative "parser"
+require_relative "shell"
+require_relative "line_editor"
+require_relative "util"
 
 class Bundler::Thor
   autoload :Actions,    File.expand_path("actions", __dir__)
diff --git a/lib/bundler/vendor/thor/lib/thor/group.rb b/lib/bundler/vendor/thor/lib/thor/group.rb
index 30db46529e5..7861d05345d 100644
--- a/lib/bundler/vendor/thor/lib/thor/group.rb
+++ b/lib/bundler/vendor/thor/lib/thor/group.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/base"
+require_relative "base"
 
 # Bundler::Thor has a special class called Bundler::Thor::Group. The main difference to Bundler::Thor class
 # is that it invokes all commands at once. It also include some methods that allows
diff --git a/lib/bundler/vendor/thor/lib/thor/line_editor.rb b/lib/bundler/vendor/thor/lib/thor/line_editor.rb
index ce81a17484d..5c0c336e7ae 100644
--- a/lib/bundler/vendor/thor/lib/thor/line_editor.rb
+++ b/lib/bundler/vendor/thor/lib/thor/line_editor.rb
@@ -1,5 +1,5 @@
-require "bundler/vendor/thor/lib/thor/line_editor/basic"
-require "bundler/vendor/thor/lib/thor/line_editor/readline"
+require_relative "line_editor/basic"
+require_relative "line_editor/readline"
 
 class Bundler::Thor
   module LineEditor
diff --git a/lib/bundler/vendor/thor/lib/thor/parser.rb b/lib/bundler/vendor/thor/lib/thor/parser.rb
index 08f80e565de..45394732caa 100644
--- a/lib/bundler/vendor/thor/lib/thor/parser.rb
+++ b/lib/bundler/vendor/thor/lib/thor/parser.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/parser/argument"
-require "bundler/vendor/thor/lib/thor/parser/arguments"
-require "bundler/vendor/thor/lib/thor/parser/option"
-require "bundler/vendor/thor/lib/thor/parser/options"
+require_relative "parser/argument"
+require_relative "parser/arguments"
+require_relative "parser/option"
+require_relative "parser/options"
diff --git a/lib/bundler/vendor/thor/lib/thor/runner.rb b/lib/bundler/vendor/thor/lib/thor/runner.rb
index 65ae422d7f2..ed44853a003 100644
--- a/lib/bundler/vendor/thor/lib/thor/runner.rb
+++ b/lib/bundler/vendor/thor/lib/thor/runner.rb
@@ -1,6 +1,6 @@
-require "bundler/vendor/thor/lib/thor"
-require "bundler/vendor/thor/lib/thor/group"
-require "bundler/vendor/thor/lib/thor/core_ext/io_binary_read"
+require_relative "../thor"
+require_relative "group"
+require_relative "core_ext/io_binary_read"
 
 require "yaml"
 require "digest/md5"
@@ -111,7 +111,7 @@ def install(name) # rubocop:disable MethodLength
 
   desc "version", "Show Bundler::Thor version"
   def version
-    require "bundler/vendor/thor/lib/thor/version"
+    require_relative "version"
     say "Bundler::Thor #{Bundler::Thor::VERSION}"
   end
 
diff --git a/lib/bundler/vendor/thor/lib/thor/shell/color.rb b/lib/bundler/vendor/thor/lib/thor/shell/color.rb
index da289cb50cf..6c821d4a091 100644
--- a/lib/bundler/vendor/thor/lib/thor/shell/color.rb
+++ b/lib/bundler/vendor/thor/lib/thor/shell/color.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/shell/basic"
+require_relative "basic"
 
 class Bundler::Thor
   module Shell
diff --git a/lib/bundler/vendor/thor/lib/thor/shell/html.rb b/lib/bundler/vendor/thor/lib/thor/shell/html.rb
index 83d20549882..55262f19cc5 100644
--- a/lib/bundler/vendor/thor/lib/thor/shell/html.rb
+++ b/lib/bundler/vendor/thor/lib/thor/shell/html.rb
@@ -1,4 +1,4 @@
-require "bundler/vendor/thor/lib/thor/shell/basic"
+require_relative "basic"
 
 class Bundler::Thor
   module Shell
diff --git a/lib/bundler/vendored_thor.rb b/lib/bundler/vendored_thor.rb
index b0b7e7be844..0666cfc9b9b 100644
--- a/lib/bundler/vendored_thor.rb
+++ b/lib/bundler/vendored_thor.rb
@@ -2,7 +2,7 @@
 
 module Bundler
   def self.require_thor_actions
-    Kernel.send(:require, "bundler/vendor/thor/lib/thor/actions")
+    require_relative "vendor/thor/lib/thor/actions"
   end
 end
 require_relative "vendor/thor/lib/thor"