diff --git a/Gemfile b/Gemfile
index ebd7190fa..843e166a1 100644
--- a/Gemfile
+++ b/Gemfile
@@ -9,7 +9,7 @@ source 'https://rubygems.org'
 gemspec
 
 gem 'bump', require: false
-gem 'oedipus_lex', require: false
+gem 'oedipus_lex', '>= 2.6.0', require: false
 gem 'racc'
 gem 'rake', '~> 13.0'
 gem 'rspec', '~> 3.7'
diff --git a/tasks/compile.rake b/tasks/compile.rake
index 42f179f54..db781c775 100644
--- a/tasks/compile.rake
+++ b/tasks/compile.rake
@@ -3,12 +3,6 @@
 require 'oedipus_lex'
 Rake.application.rake_require 'oedipus_lex'
 
-# Patch gem, see https://github.com/seattlerb/oedipus_lex/pull/15
-class OedipusLex
-  remove_const :RE
-  RE = %r{(/(?:\\.|[^/])*/[ion]?)}.freeze
-end
-
 def update_file(path)
   content = File.read(path)
   File.write(path, yield(content))