diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 549a2fe..38f6750 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.13", "pypy3.10"]
+        python-version: ["3.9", "3.13-dev", "pypy3.10"]
     steps:
       - uses: actions/checkout@v4
         with: