issue #3554: ctypes.string_at and ctypes.wstring_at must use the
pythonapi calling convention so that the GIL is held and error return
values are checked.
diff --git a/Misc/NEWS b/Misc/NEWS
index 586aa7c..5349c55 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -199,6 +199,10 @@
 Library
 -------
 
+- Issue #3554: ctypes.string_at and ctypes.wstring_at did call Python
+  api functions without holding the GIL, which could lead to a fatal
+  error when they failed.
+
 - Issue #799428: Fix Tkinter.Misc._nametowidget to unwrap Tcl command objects.
 
 - Issue #3395: fix reference in test_multiprocessing to old debugInfo method