diff --git a/.github/workflows/release-artifacts.yml b/.github/workflows/release-artifacts.yml
index d346aeb597..c88546c3bf 100644
--- a/.github/workflows/release-artifacts.yml
+++ b/.github/workflows/release-artifacts.yml
@@ -150,12 +150,14 @@ jobs:
       - name: Build wheels
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
-          # Skip testing for platforms which various libraries don't have wheels
-          # for, and so need extra build deps.
+          # The platforms that we build for are determined by the
+          # `tool.cibuildwheel.skip` option in `pyproject.toml`.
+
+          # We skip testing wheels for the following platforms in CI:
           #
-          # cp39-*: Python 3.9 is EOL.
-          # cp3??t-*: Free-threaded builds are not currently supported.
-          CIBW_TEST_SKIP: pp3*-* cp39-* cp3??t-* *i686* *musl*
+          # pp3*-* (PyPy wheels) broke in CI (TODO: investigate).
+          # musl: (TODO: investigate).
+          CIBW_TEST_SKIP: pp3*-* *musl*
 
       - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5.0.0
         with:
diff --git a/CHANGES.md b/CHANGES.md
index 8fbd50f20e..b30ea24b0d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,4 +1,4 @@
-# Synapse 1.142.0rc4 (2025-11-07)
+# Synapse 1.142.0 (2025-11-11)
 
 ## Dropped support for Python 3.9
 
@@ -29,6 +29,15 @@ of these wheels downstream, please reach out to us in
 [#synapse-dev:matrix.org](https://matrix.to/#/#synapse-dev:matrix.org). We'd
 love to hear from you!
 
+## Internal Changes
+
+- Properly stop building wheels for Python 3.9 and free-threaded CPython. ([\#19154](https://github.com/element-hq/synapse/issues/19154))
+
+
+
+
+# Synapse 1.142.0rc4 (2025-11-07)
+
 ## Bugfixes
 
 - Fix a bug introduced in 1.142.0rc1 where any attempt to configure `matrix_authentication_service.secret_path` would prevent the homeserver from starting up. ([\#19144](https://github.com/element-hq/synapse/issues/19144))
diff --git a/debian/changelog b/debian/changelog
index 6531a59569..1c3b9dff46 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,9 @@
+matrix-synapse-py3 (1.142.0) stable; urgency=medium
+
+  * New Synapse release 1.142.0.
+
+ -- Synapse Packaging team <packages@matrix.org>  Tue, 11 Nov 2025 09:45:51 +0000
+
 matrix-synapse-py3 (1.142.0~rc4) stable; urgency=medium
 
   * New Synapse release 1.142.0rc4.
diff --git a/pyproject.toml b/pyproject.toml
index 7b60dd06f6..00dbf2a0fa 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -112,7 +112,7 @@ module-name = "synapse.synapse_rust"
 
 [tool.poetry]
 name = "matrix-synapse"
-version = "1.142.0rc4"
+version = "1.142.0"
 description = "Homeserver for the Matrix decentralised comms protocol"
 authors = ["Matrix.org Team and Contributors <packages@matrix.org>"]
 license = "AGPL-3.0-or-later OR LicenseRef-Element-Commercial"
@@ -397,13 +397,23 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.cibuildwheel]
 # Skip unsupported platforms (by us or by Rust).
-# See https://cibuildwheel.readthedocs.io/en/stable/options/#build-skip for the list of build targets.
+#
+# See https://cibuildwheel.readthedocs.io/en/stable/options/#build-skip for the
+# list of supported build targets.
+#
+# Also see `.github/workflows/release-artifacts.yml` for the list of
+# architectures we build for (based on the runner OS types we use), as well as
+# the platforms we exclude from testing in CI.
+#
 # We skip:
-#  - CPython 3.8: EOLed
-#  - musllinux i686: excluded to reduce number of wheels we build.
-#    c.f. https://github.com/matrix-org/synapse/pull/12595#discussion_r963107677
-skip = "cp38* *-musllinux_i686"
-# Enable non-default builds.
+#  - free-threaded cpython builds: these are not currently supported.
+#  - cp38: Python 3.8 is end-of-life.
+#  - cp39: Python 3.9 is end-of-life.
+#  - i686: We don't support 32-bit platforms.
+skip = "cp3??t-* cp38-* cp39-* *i686*"
+# Enable non-default builds. See the list of available options:
+# https://cibuildwheel.pypa.io/en/stable/options#enable
+#
 # "pypy" used to be included by default up until cibuildwheel 3.
 enable = "pypy"