diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3e271ff..d2f6237 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python: ['3.7', '3.8']
+        python: ['3.7', '3.8', '3.9']
         spawn_backend: ['trio', 'mp']
     steps:
       - name: Checkout