diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
index 583cd9a..3238437 100644
--- a/.github/workflows/pythonpackage.yml
+++ b/.github/workflows/pythonpackage.yml
@@ -5,7 +5,7 @@ name: Python package
 
 on:
   push:
-    branches: [ master, citests ]
+    branches: [ master, citests, to-3.9]
   pull_request:
     branches: [ master ]
 
@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2