diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 0279380..08c5829 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,7 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
     steps:
       - name: Set git to use LF on Windows
         if: runner.os == 'Windows'
@@ -32,7 +32,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           submodules: recursive
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
diff --git a/setup.py b/setup.py
index c545fd1..9072253 100644
--- a/setup.py
+++ b/setup.py
@@ -93,10 +93,12 @@ def finalize_options(self):
     author_email="cory@lukasa.co.uk",
 
     setup_requires=[
-        "cffi>=1.0.0",
+        "cffi>=1.0.0; python_version<'3.13'",
+        "cffi>=1.17.0; python_version>='3.13'",
     ],
     install_requires=[
-        "cffi>=1.0.0",
+        "cffi>=1.0.0; python_version<'3.13'",
+        "cffi>=1.17.0; python_version>='3.13'",
     ],
     python_requires=">=3.7",
     cffi_modules=["src/brotlicffi/_build.py:ffi"],