diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ddb793e1..f4d8cf668 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -164,7 +164,7 @@ jobs:
   codeql:
     if: "!contains(github.event.head_commit.message, '[ci skip]')"
     timeout-minutes: 30
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2