diff -up PyQt5_sip-12.9.1/siplib.c.py311 PyQt5_sip-12.9.1/siplib.c

--- PyQt5_sip-12.9.1/siplib.c.py311	2022-02-01 08:29:23.000000000 -0500

+++ PyQt5_sip-12.9.1/siplib.c	2022-03-11 20:46:19.056212494 -0500

@@ -12750,7 +12750,14 @@ static struct _frame *sip_api_get_frame(

     while (frame != NULL && depth > 0)

     {

+#if PY_VERSION_HEX < 0x03090000

         frame = frame->f_back;

+#else

+        frame = PyFrame_GetBack(frame);

+

+        /* Historically we return a borrowed reference. */

+        Py_XDECREF(frame);

+#endif

         --depth;

     }