diff --git a/.github/workflows/ci-cd.yml b/.github/workflows/ci-cd.yml
index 98ef423..f9a6f65 100644
--- a/.github/workflows/ci-cd.yml
+++ b/.github/workflows/ci-cd.yml
@@ -38,7 +38,7 @@ env:
   PY_COLORS: 1  # Recognized by the `py` package, dependency of `pytest`
   PYTHONIOENCODING: utf-8
   PYTHONUTF8: 1
-  PYTHON_LATEST: 3.12
+  PYTHON_LATEST: 3.13
 
 
 jobs:
@@ -184,6 +184,7 @@ jobs:
     strategy:
       matrix:
         pyver:
+        - 3.13t
         - 3.13
         - 3.12
         - 3.11
@@ -229,9 +230,11 @@ jobs:
         pattern: ${{ needs.pre-setup.outputs.dists-artifact-name }}*
         merge-multiple: true
 
+    # TODO: Revert back to using actions/setup-python once the official
+    # action supports free-threaded Python
     - name: Setup Python ${{ matrix.pyver }}
       id: python-install
-      uses: actions/setup-python@v5
+      uses: quansight-labs/setup-python@v5
       with:
         python-version: ${{ matrix.pyver }}
         allow-prereleases: true
diff --git a/.github/workflows/reusable-linters.yml b/.github/workflows/reusable-linters.yml
index 1b0c6e4..e1c86ec 100644
--- a/.github/workflows/reusable-linters.yml
+++ b/.github/workflows/reusable-linters.yml
@@ -21,7 +21,7 @@ env:
   PY_COLORS: 1  # Recognized by the `py` package, dependency of `pytest`
   PYTHONIOENCODING: utf-8
   PYTHONUTF8: 1
-  PYTHON_LATEST: 3.12
+  PYTHON_LATEST: 3.13
 
 jobs:
 
diff --git a/CHANGES/84.feature.rst b/CHANGES/84.feature.rst
new file mode 100644
index 0000000..c5da0e0
--- /dev/null
+++ b/CHANGES/84.feature.rst
@@ -0,0 +1 @@
+Implemented support for the free-threaded build of CPython 3.13 -- by :user:`lysnikolaou`.
diff --git a/CHANGES/84.packaging.rst b/CHANGES/84.packaging.rst
new file mode 100644
index 0000000..911a78b
--- /dev/null
+++ b/CHANGES/84.packaging.rst
@@ -0,0 +1 @@
+Started building wheels for the free-threaded build of CPython 3.13 -- by :user:`lysnikolaou`.
diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
index 69ac7e8..9ae57bc 100644
--- a/docs/spelling_wordlist.txt
+++ b/docs/spelling_wordlist.txt
@@ -1,5 +1,6 @@
 Bluesky
 Bugfixes
+CPython
 Changelog
 Codecov
 Cython
diff --git a/packaging/pep517_backend/_backend.py b/packaging/pep517_backend/_backend.py
index 2f5bf95..a43059c 100644
--- a/packaging/pep517_backend/_backend.py
+++ b/packaging/pep517_backend/_backend.py
@@ -4,6 +4,7 @@
 from __future__ import annotations
 
 import os
+import sysconfig
 import typing as t
 from contextlib import contextmanager, nullcontext, suppress
 from functools import partial
@@ -371,10 +372,13 @@ def get_requires_for_build_wheel(
             stacklevel=999,
         )
 
-    c_ext_build_deps = [] if is_pure_python_build else [
-        'Cython ~= 3.0.0; python_version >= "3.12"',
-        'Cython; python_version < "3.12"',
-    ]
+    if is_pure_python_build:
+        c_ext_build_deps = []
+    elif sysconfig.get_config_var("Py_GIL_DISABLED"):
+        # TODO: Remove when there's a Cython final with free-threading support
+        c_ext_build_deps = ['Cython == 3.1.0a1']
+    else:
+        c_ext_build_deps = ['Cython ~= 3.0.0']
 
     return _setuptools_get_requires_for_build_wheel(
         config_settings=config_settings,
diff --git a/pyproject.toml b/pyproject.toml
index 88d82b5..02dce1f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -64,6 +64,7 @@ linetrace = "True"  # Implies `profile=True`
 
 [tool.cibuildwheel]
 build-frontend = "build"
+enable = ["cpython-freethreading"]
 before-test = [
   # NOTE: Attempt to have pip pre-compile PyYAML wheel with our build
   # NOTE: constraints unset. The hope is that pip will cache that wheel
diff --git a/requirements/cython.txt b/requirements/cython.txt
index 3eaca16..0dd05b9 100644
--- a/requirements/cython.txt
+++ b/requirements/cython.txt
@@ -1 +1,2 @@
-cython==3.0.11
+cython==3.0.11; python_version < '3.13'
+cython==3.1.0a1; python_version >= '3.13'
diff --git a/src/propcache/_helpers_c.pyx b/src/propcache/_helpers_c.pyx
index 0c42ff3..49ad946 100644
--- a/src/propcache/_helpers_c.pyx
+++ b/src/propcache/_helpers_c.pyx
@@ -1,4 +1,4 @@
-# cython: language_level=3
+# cython: language_level=3, freethreading_compatible=True
 from types import GenericAlias