diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 229f09d0..abe4063c 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,6 +1,6 @@
 pywws - Python software for USB Wireless Weather Stations
 http://github.com/jim-easterbrook/pywws
-Copyright (C) 2008-20  pywws contributors
+Copyright (C) 2008-21  pywws contributors
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License
@@ -16,6 +16,12 @@ You should have received a copy of the GNU General Public License
 along with this program; if not, write to the Free Software
 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
+Changes in v21.3.0:
+    1/ Added -d option to pywws-setweatherstation. This is useful if your
+       station sets loads of alarms after a reset.
+    2/ Updated pywws.timezone to cope with changes in Python 3.6.
+    3/ Various bug fixes and minor improvements.
+
 Changes in v20.1.0:
     1/ Added a "Windy" service uploader module.
     2/ Various bug fixes and minor improvements.
diff --git a/src/pywws/__init__.py b/src/pywws/__init__.py
index 5ba0663a..c4944798 100644
--- a/src/pywws/__init__.py
+++ b/src/pywws/__init__.py
@@ -1,3 +1,3 @@
 __version__ = '21.3.0'
-_release = '1683'
-_commit = 'd868333'
+_release = '1684'
+_commit = '7276f5c'