diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 3c9c397..efc510e 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,5 +1,15 @@
 Changelog
 =========
+
+0.4.0
+`````
+Version 0.4.0 updates python-bsonjs's vendored copy of libbson to 1.24.2.
+For a detailed breakdown of what changed in each version of libbson see its changelog:
+https://github.com/mongodb/mongo-c-driver/blob/1.24.2/src/libbson/NEWS
+http://mongoc.org/libbson/1.24.2/
+
+This release also adds support for Python 3.11 and 3.12.
+
 0.3.0
 `````
 
diff --git a/pyproject.toml b/pyproject.toml
index ebf2220..38aba08 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ packages = []
 
 [project]
 name = "python-bsonjs"
-version = "0.3.0"
+version = "0.4.0"
 description = "A library for converting between BSON and JSON."
 readme = "README.rst"
 license = { file = "LICENSE" }