diff --git a/.github/workflows/retile.yml b/.github/workflows/retile.yml
index 6150b2e..1f5ea5c 100644
--- a/.github/workflows/retile.yml
+++ b/.github/workflows/retile.yml
@@ -9,7 +9,7 @@ permissions:
 env:
   PIP_CACHE_KEY: retile-pip-${{ github.run_id }}
   PYTHONUNBUFFERED: 1
-  PYTHON_VER: "3.14t"
+  PYTHON_VER: "3.15t"
   PYTHON_DEPS: "boto3 openslide-bin openslide-python requests"
 
 jobs:
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 86e2455..2159ca1 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -19,7 +19,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v7
         with:
-          python-version: 3.14
+          python-version: 3.15
       - name: Install dependencies
         run: python -m pip install prek uv
       - name: Cache pre-commit environments