diff --git a/.github/workflows/tox.yml b/.github/workflows/tox.yml
index 2769d133..3bd7a0dc 100644
--- a/.github/workflows/tox.yml
+++ b/.github/workflows/tox.yml
@@ -17,7 +17,7 @@ jobs:
         architecture: x64
     - run: rm -f /etc/boto.cfg
     - run: pip3 install --upgrade pip setuptools
-    - run: pip3 install 'tox'
+    - run: pip3 install 'tox<4.11'
     - run: tox -- -n0
 
     - name: Run coverage