diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 11de440..3d3f57f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -114,7 +114,7 @@ jobs:
       # Atheris only ships Linux x86-64 wheels, for CPython 3.12-3.14
       - uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
-          python-version: "3.13"
+          python-version: "3.15"
 
       - name: Install Atheris (hash-checked)
         run: 'python -m pip install --require-hashes --only-binary :all: -r tests/requirements-fuzz.txt'