diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 6c4f6b4e..cd37daa4 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,6 +1,13 @@
 SWIFTsimIO Changelog
 ====================
 
+v 4.4.0
+-------
+
++ Fixed bug where cosmological conversions (to/from physical)
+  were being applied in the wrong direction. Thanks @wmfw23 for
+  reporting this.
+
 v 4.3.1
 -------
 
diff --git a/swiftsimio/__version__.py b/swiftsimio/__version__.py
index ed48cdab..ecdb1cef 100644
--- a/swiftsimio/__version__.py
+++ b/swiftsimio/__version__.py
@@ -1 +1 @@
-__version__ = "4.3.1"
+__version__ = "4.4.0"