diff --git a/.github/workflows/tox.yaml b/.github/workflows/tox.yaml
index d77812e4..6a6a84be 100644
--- a/.github/workflows/tox.yaml
+++ b/.github/workflows/tox.yaml
@@ -32,6 +32,8 @@ jobs:
   func:
     runs-on: ubuntu-latest
     strategy:
+      matrix:
+        python-version: [3.8]
       fail-fast: false
       matrix:
         juju_channel: