diff --git a/.github/workflows/tox.yaml b/.github/workflows/tox.yaml
index d77812e4..81c0c7e9 100644
--- a/.github/workflows/tox.yaml
+++ b/.github/workflows/tox.yaml
@@ -34,6 +34,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        python-version: [3.8]
         juju_channel:
           - 2.9/stable
         bundle: