try to fix downstream

.github/workflows/downstream.yml

@@ -1,52 +1,52 b''
 name: Run Downstream tests
 
 on:
   push:
   pull_request:
   # Run weekly on Monday at 1:23 UTC
   schedule:
   - cron:  '23 1 * * 1'
   workflow_dispatch:
 
 permissions:
   contents: read
 
 jobs:
   test:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os: [ubuntu-latest]
         python-version: ["3.9"]
         include:
           - os: macos-latest
             python-version: "3.9"
 
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python-version }}
     - name: Update Python installer
       run: |
         python -m pip install --upgrade pip setuptools wheel
     - name: Install ipykernel
       run: |
         cd .. 
         git clone https://github.com/ipython/ipykernel
         cd ipykernel
         pip install -e .[test] 
         cd ..
     - name: Install and update Python dependencies
       run: |
         python -m pip install --upgrade -e file://$PWD#egg=ipython[test]
         # we must install IPython after ipykernel to get the right versions.
         python -m pip install --upgrade --upgrade-strategy eager flaky ipyparallel
-        python -m pip install --upgrade 'pytest<7' 
+        python -m pip install --upgrade 'pytest<7'  'pytest_asyncio<0.21'
     - name: pytest
       env:
         COLUMNS: 120
       run: |
         cd ../ipykernel
         pytest