diff --git a/lib/ridl/parser.rb b/lib/ridl/parser.rb
index db7df7c..f5e15d2 100644
--- a/lib/ridl/parser.rb
+++ b/lib/ridl/parser.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 #
 # DO NOT MODIFY!!!!
-# This file is automatically generated by Racc 1.7.3
+# This file is automatically generated by Racc 1.8.0
 # from Racc grammar file "parser.ry".
 #
 
@@ -24,7 +24,7 @@
 $".push "#{__dir__}/racc/info.rb"
 
 module Racc
-  VERSION   = '1.7.3'
+  VERSION   = '1.8.0'
   Version = VERSION
   Copyright = 'Copyright (c) 1999-2006 Minero Aoki'
 end
@@ -32,10 +32,6 @@ module Racc
 end
 
 
-unless defined?(NotImplementedError)
-  NotImplementedError = NotImplementError # :nodoc:
-end
-
 module Racc
   class ParseError < StandardError; end
 end