diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 0e35bf372..11de61b05 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,7 +1,7 @@
 Changelog
 ---------
 
-3.21.3 (unreleased)
+3.21.3 (2024-06-05)
 *******************
 
 Bug fixes:
diff --git a/pyproject.toml b/pyproject.toml
index a52f79373..b522d65aa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "marshmallow"
-version = "3.21.2"
+version = "3.21.3"
 description = "A lightweight library for converting complex datatypes to and from native Python datatypes."
 readme = "README.rst"
 license = { file = "LICENSE" }