diff --git a/benchmark/benchmark_helper.rb b/benchmark/benchmark_helper.rb
index cf8a5d9..fc1c117 100644
--- a/benchmark/benchmark_helper.rb
+++ b/benchmark/benchmark_helper.rb
@@ -1,3 +1,4 @@
+require 'bundler/setup'
 require 'stringio'
 require 'benchmark'
 require 'benchmark/ips'
diff --git a/lib/oga.rb b/lib/oga.rb
index acf4b44..ff53482 100644
--- a/lib/oga.rb
+++ b/lib/oga.rb
@@ -3,19 +3,19 @@ require 'set'
 require 'stringio'
 require 'thread'
 
-require_relative 'oga/version'
-require_relative 'oga/oga'
-require_relative 'oga/lru'
-require_relative 'oga/entity_decoder'
-require_relative 'oga/blacklist'
-require_relative 'oga/whitelist'
+require 'oga/version'
+require 'oga/oga'
+require 'oga/lru'
+require 'oga/entity_decoder'
+require 'oga/blacklist'
+require 'oga/whitelist'
 
 # Load these first so that the native extensions don't have to define the
 # Oga::XML namespace.
-require_relative 'oga/xml/lexer'
-require_relative 'oga/xml/parser'
+require 'oga/xml/lexer'
+require 'oga/xml/parser'
 
-require_relative 'liboga'
+require 'liboga'
 
 #:nocov:
 if RUBY_PLATFORM == 'java'
@@ -23,35 +23,35 @@ if RUBY_PLATFORM == 'java'
 end
 #:nocov:
 
-require_relative 'oga/xml/html_void_elements'
-require_relative 'oga/xml/entities'
-require_relative 'oga/xml/querying'
-require_relative 'oga/xml/traversal'
-require_relative 'oga/xml/node'
-require_relative 'oga/xml/document'
-require_relative 'oga/xml/character_node'
-require_relative 'oga/xml/text'
-require_relative 'oga/xml/comment'
-require_relative 'oga/xml/cdata'
-require_relative 'oga/xml/xml_declaration'
-require_relative 'oga/xml/processing_instruction'
-require_relative 'oga/xml/doctype'
-require_relative 'oga/xml/namespace'
-require_relative 'oga/xml/default_namespace'
-require_relative 'oga/xml/attribute'
-require_relative 'oga/xml/element'
-require_relative 'oga/xml/node_set'
+require 'oga/xml/html_void_elements'
+require 'oga/xml/entities'
+require 'oga/xml/querying'
+require 'oga/xml/traversal'
+require 'oga/xml/node'
+require 'oga/xml/document'
+require 'oga/xml/character_node'
+require 'oga/xml/text'
+require 'oga/xml/comment'
+require 'oga/xml/cdata'
+require 'oga/xml/xml_declaration'
+require 'oga/xml/processing_instruction'
+require 'oga/xml/doctype'
+require 'oga/xml/namespace'
+require 'oga/xml/default_namespace'
+require 'oga/xml/attribute'
+require 'oga/xml/element'
+require 'oga/xml/node_set'
 
-require_relative 'oga/xml/sax_parser'
-require_relative 'oga/xml/pull_parser'
+require 'oga/xml/sax_parser'
+require 'oga/xml/pull_parser'
 
-require_relative 'oga/html/parser'
-require_relative 'oga/html/sax_parser'
-require_relative 'oga/html/entities'
+require 'oga/html/parser'
+require 'oga/html/sax_parser'
+require 'oga/html/entities'
 
-require_relative 'oga/xpath/lexer'
-require_relative 'oga/xpath/parser'
-require_relative 'oga/xpath/evaluator'
+require 'oga/xpath/lexer'
+require 'oga/xpath/parser'
+require 'oga/xpath/evaluator'
 
-require_relative 'oga/css/lexer'
-require_relative 'oga/css/parser'
+require 'oga/css/lexer'
+require 'oga/css/parser'
diff --git a/profile/profile_helper.rb b/profile/profile_helper.rb
index ea98355..1fdc1eb 100644
--- a/profile/profile_helper.rb
+++ b/profile/profile_helper.rb
@@ -1,3 +1,4 @@
+require 'bundler/setup'
 require 'timeout'
 require 'stringio'