diff --git a/Lib/ctypes/__init__.py b/Lib/ctypes/__init__.py
index 5da1849725c..4987a794805 100644
--- a/Lib/ctypes/__init__.py
+++ b/Lib/ctypes/__init__.py
@@ -5,7 +5,7 @@
 
 import os as _os, sys as _sys
 
-__version__ = "0.9.9.7"
+__version__ = "1.0.0"
 
 from _ctypes import Union, Structure, Array
 from _ctypes import _Pointer
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index b3329321efa..dd5c717bb5f 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -4673,7 +4673,7 @@ init_ctypes(void)
 #endif
 	PyModule_AddObject(m, "FUNCFLAG_CDECL", PyInt_FromLong(FUNCFLAG_CDECL));
 	PyModule_AddObject(m, "FUNCFLAG_PYTHONAPI", PyInt_FromLong(FUNCFLAG_PYTHONAPI));
-	PyModule_AddStringConstant(m, "__version__", "0.9.9.7");
+	PyModule_AddStringConstant(m, "__version__", "1.0.0");
 
 	PyModule_AddObject(m, "_memmove_addr", PyLong_FromVoidPtr(memmove));
 	PyModule_AddObject(m, "_memset_addr", PyLong_FromVoidPtr(memset));