diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 998aaaa..d800ed3 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,7 +33,7 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip setuptools wheel
-          python -m pip install --upgrade 'tox>=4.0.0rc3'
+          python -m pip install --upgrade 'tox==4.0.0rc1'
 
       - name: Run tox targets for ${{ matrix.python-version }}
         run: tox run -f py$(echo ${{ matrix.python-version }} | tr -d .)