diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4e302a4..3cfa6e3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -38,8 +38,8 @@ jobs:
         swift:
           - '5.6'
           - '5.9'
-    name: Ubuntu (Swift ${{ matrix.swift }}, ${{ matrix.config }})
-    runs-on: ubuntu-latest
+    name: Ubuntu (Swift ${{ matrix.swift }})
+    runs-on: ubuntu-20.04
     steps:
       - uses: swift-actions/setup-swift@v1
         with: