diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index b2d29c7..cb8b350 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
         os: [windows-latest, macos-latest, ubuntu-latest]
     steps:
       - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index dad5425..0813d12 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ dynamic = [
   "version",
 ]
 dependencies = [
+  "cffi>=v1.17.0rc1", # remove once v1.17.0 is out; add 3.13 classifier above (see #127)
   "click>=6",
   "gidgethub",
   "requests",