diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index caeb4497..dff66e0d 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -12,7 +12,7 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         compiler: [clang-6, gcc-7, gcc-8, gcc-9]