diff --git a/.github/workflows/unit_tests.yaml b/.github/workflows/unit_tests.yaml
index 6a21d166f89..08f88165e4a 100644
--- a/.github/workflows/unit_tests.yaml
+++ b/.github/workflows/unit_tests.yaml
@@ -11,7 +11,7 @@ concurrency:
 jobs:
   # Run unit tests with different configurations on linux
   ubuntu:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ['2.7', '3.6', '3.7', '3.8', '3.9', '3.10', '3.11']