diff --git a/.github/workflows/test_ubuntu.yml b/.github/workflows/test_ubuntu.yml
index 131c04bf1a..320079f3ca 100644
--- a/.github/workflows/test_ubuntu.yml
+++ b/.github/workflows/test_ubuntu.yml
@@ -5,7 +5,10 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   build:
-    runs-on: ubuntu-18.04
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-18.04, ubuntu-20.04]
 
     steps:
       - uses: actions/checkout@v2