diff --git a/CHANGES.txt b/CHANGES.txt
index 70c60c6..801a968 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,5 +1,16 @@
 Revision history
 ----------------
+0.20.0, 2023-10-XX
+ * Fix #245, never introduce new nodes during discard.
+ * Fix #268, do not rely on well implemented __ne__ for keys in pmaps, instead do explicit inversion of equality
+   comparison when checking for inequality.
+ * Officially support Python 3.12.
+ * Officially drop support for Python 3.7.
+ * Fix #273, build more types of wheels. Thanks @jams2 for this!
+ * Fix #282, add generic types to types. Thanks @lukasK9999 for this!
+ * Fix #281, defaultdict can now be frozen. NB! This is a backwards incompatible fix since defaultdict was not
+   previously frozen.
+
 0.19.3, 2022-12-29
  * Fix #264, add wheels and official support for Python 3.11. Thanks @hugovk for this!
 
diff --git a/LICENSE.mit b/LICENSE.mit
index 6cbf251..8a32be2 100644
--- a/LICENSE.mit
+++ b/LICENSE.mit
@@ -1,4 +1,4 @@
-Copyright (c) 2022 Tobias Gustafsson
+Copyright (c) 2023 Tobias Gustafsson
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
diff --git a/README.rst b/README.rst
index 56346fb..64bb585 100644
--- a/README.rst
+++ b/README.rst
@@ -719,6 +719,12 @@ Andy Reagan https://github.com/andyreagan
 
 Aaron Durant https://github.com/Aaron-Durant
 
+Joshua Munn https://github.com/jams2
+
+Lukas https://github.com/lukasK9999
+
+Arshad https://github.com/arshad-ml
+
 Contributing
 ------------
 
diff --git a/_pyrsistent_version.py b/_pyrsistent_version.py
index b699138..42ebddf 100644
--- a/_pyrsistent_version.py
+++ b/_pyrsistent_version.py
@@ -1 +1 @@
-__version__ = '0.19.3'
+__version__ = '0.20.0rc1'