diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7b0982a4..ac9dd6a2 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ on:
 
 jobs:
   cross-build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     strategy:
       matrix:
         arch: