diff --git a/cxxheaderparser/_ply/__init__.py b/cxxheaderparser/_ply/__init__.py
index e69de29..863ef54 100644
--- a/cxxheaderparser/_ply/__init__.py
+++ b/cxxheaderparser/_ply/__init__.py
@@ -0,0 +1,5 @@
+# PLY package
+# Author: David Beazley (dave@dabeaz.com)
+# https://github.com/dabeaz/ply
+
+__version__ = "2022.10.27"
diff --git a/cxxheaderparser/_ply/lex.py b/cxxheaderparser/_ply/lex.py
index 37a29b6..766a917 100644
--- a/cxxheaderparser/_ply/lex.py
+++ b/cxxheaderparser/_ply/lex.py
@@ -2,7 +2,7 @@
 # -----------------------------------------------------------------------------
 # ply: lex.py
 #
-# Copyright (C) 2001-2020
+# Copyright (C) 2001-2022
 # David M. Beazley (Dabeaz LLC)
 # All rights reserved.
 #