diff --git a/addon/globalPlugins/addonUpdater/__init__.py b/addon/globalPlugins/addonUpdater/__init__.py
index c30fcb7..e400b17 100644
--- a/addon/globalPlugins/addonUpdater/__init__.py
+++ b/addon/globalPlugins/addonUpdater/__init__.py
@@ -28,7 +28,7 @@
 
 # Overall update check routine was inspired by StationPlaylist Studio add-on (Joseph Lee).)
 
-addonUpdateCheckInterval = 86400
+addonUpdateCheckInterval = 21600  # 6 hours; was 86400 (24 hours)
 updateChecker = None
 
 
diff --git a/buildVars.py b/buildVars.py
index e89f361..0ec5a6e 100644
--- a/buildVars.py
+++ b/buildVars.py
@@ -25,7 +25,7 @@ def _(arg):
 	# Translators: Long description to be shown for this add-on on add-on information from add-ons manager
 	"addon_description": _("""Proof of concept implementation of add-on update feature (NVDA Core issue 3208)"""),
 	# version
-	"addon_version": "24.2.501",
+	"addon_version": "24.2.502",
 	# Author(s)
 	"addon_author": "Joseph Lee <joseph.lee22590@gmail.com>, Luke Davis <XLTechie@newanswertech.com>",
 	# URL for the add-on documentation support
diff --git a/readme.md b/readme.md
index 910f5a4..5f1cd66 100644
--- a/readme.md
+++ b/readme.md
@@ -43,6 +43,14 @@ The available add-on update sources are:
 * Spanish community add-ons catalog
 * Catalogs maintained by NVDA communities in China and Taiwan
 
+## Version 24.2.2
+
+* Lower update interval to six hours.
+
+## Version 24.2.1
+
+* Fixes a problem wherein Updater's updates, which appear in the external channel, were shown as still updatable in the store via the stable (or other) channel. Caused by residual JSON files from old non-external installations. Now they are removed.
+
 ## Version 24.2.0
 
 * Release compatible with NVDA 2024.1.