diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e7ed515..99c2eb2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -3,10 +3,10 @@ name: CI
 on:
   push:
     branches:
-      - master
+      - main
   pull_request:
     branches:
-      - master
+      - main
   workflow_dispatch:
 
 jobs:
@@ -15,12 +15,12 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
-        python: [3.6, 3.9]
+        os: ["ubuntu-20.04"]
+        python: [3.6, 3.9, 3.11]
     steps:
       - uses: actions/checkout@v2
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v3
         with:
           python-version: ${{ matrix.python }}
       - name: Install tox