diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 467ec3ffd741..b11a81f3fbc5 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -3,10 +3,8 @@ Changelog
 
 .. _v42-0-0:
 
-42.0.0 - `main`_
-~~~~~~~~~~~~~~~~
-
-.. note:: This version is not yet released and is under active development.
+42.0.0 - 2024-01-22
+~~~~~~~~~~~~~~~~~~~
 
 * **BACKWARDS INCOMPATIBLE:** Dropped support for LibreSSL < 3.7.
 * **BACKWARDS INCOMPATIBLE:** Loading a PKCS7 with no content field using
@@ -66,7 +64,7 @@ Changelog
   for :class:`~cryptography.x509.Certificate` chains. These APIs should be
   considered unstable and not subject to our stability guarantees until
   documented as such in a future release.
-* Added support for 
+* Added support for
   :class:`~cryptography.hazmat.primitives.ciphers.algorithms.SM4`
   :class:`~cryptography.hazmat.primitives.ciphers.modes.GCM`
   when using OpenSSL 3.0 or greater.
diff --git a/pyproject.toml b/pyproject.toml
index bb93dff82f52..6369bebf7620 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "cryptography"
-version = "42.0.0.dev1"
+version = "42.0.0"
 authors = [
     {name = "The Python Cryptographic Authority and individual contributors", email = "cryptography-dev@python.org"}
 ]
diff --git a/src/cryptography/__about__.py b/src/cryptography/__about__.py
index 103c77eb7b63..7d62a32b6fab 100644
--- a/src/cryptography/__about__.py
+++ b/src/cryptography/__about__.py
@@ -10,7 +10,7 @@
     "__copyright__",
 ]
 
-__version__ = "42.0.0.dev1"
+__version__ = "42.0.0"
 
 
 __author__ = "The Python Cryptographic Authority and individual contributors"
diff --git a/vectors/cryptography_vectors/__about__.py b/vectors/cryptography_vectors/__about__.py
index bc114b667491..6040ee84583e 100644
--- a/vectors/cryptography_vectors/__about__.py
+++ b/vectors/cryptography_vectors/__about__.py
@@ -6,4 +6,4 @@
     "__version__",
 ]
 
-__version__ = "42.0.0.dev1"
+__version__ = "42.0.0"
diff --git a/vectors/pyproject.toml b/vectors/pyproject.toml
index 704bc0a5a96b..0c43684bb92a 100644
--- a/vectors/pyproject.toml
+++ b/vectors/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "flit_core.buildapi"
 
 [project]
 name = "cryptography_vectors"
-version = "42.0.0.dev1"
+version = "42.0.0"
 authors = [
     {name = "The Python Cryptographic Authority and individual contributors", email = "cryptography-dev@python.org"}
 ]