diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index b5bb507cc..645bf782b 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -81,7 +81,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.13"
           cache: 'pip'
 
       - name: Install numcodecs
@@ -131,7 +131,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
-          python-version: ${{ matrix.python-version }}
+          python-version: "3.13"
           cache: 'pip'
 
       - name: Install numcodecs and Zarr