diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 5e28fef03..1f35c7462 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,6 +1,14 @@
 Changelog
 ---------
 
+3.21.2 (2024-05-01)
+*******************
+
+Bug fixes:
+
+- Allow timestamp 0 in ``fields.DateTime`` (:issue:`2133`).
+  Thanks :user:`flydzen` for reporting.
+
 3.21.1 (2024-03-04)
 *******************
 
diff --git a/pyproject.toml b/pyproject.toml
index b5294bd8f..a52f79373 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "marshmallow"
-version = "3.21.1"
+version = "3.21.2"
 description = "A lightweight library for converting complex datatypes to and from native Python datatypes."
 readme = "README.rst"
 license = { file = "LICENSE" }