diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6424472..6a57a3a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 8
       matrix:
-        os: [ubuntu-18.04, ubuntu-22.04, macos-12]
+        os: [ubuntu-20.04, ubuntu-22.04, macos-12]
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
     steps:
     - uses: actions/checkout@v3