diff --git a/.github/workflows/Linux_x86_64_test.yml b/.github/workflows/Linux_x86_64_test.yml
index 258db22ed..289949398 100644
--- a/.github/workflows/Linux_x86_64_test.yml
+++ b/.github/workflows/Linux_x86_64_test.yml
@@ -14,7 +14,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v3