Issue #14775: Fix a potential quadratic dict build-up due to the garbage collector repeatedly trying to untrack dicts.
Additional comments by Tim Silk.
diff --git a/Misc/ACKS b/Misc/ACKS
index a928088..5ebdb39 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -866,6 +866,7 @@
 Itamar Shtull-Trauring
 Eric Siegerman
 Paul Sijben
+Tim Silk
 Kirill Simonov
 Nathan Paul Simons
 Janne Sinkkonen
diff --git a/Misc/NEWS b/Misc/NEWS
index 059a1e0..1a01113 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #14775: Fix a potential quadratic dict build-up due to the garbage
+  collector repeatedly trying to untrack dicts.
+
 - Issue #14494: Fix __future__.py and its documentation to note that
   absolute imports are the default behavior in 3.0 instead of 2.7.
   Patch by Sven Marnach.