diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 043594cc6..d09a8721d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.10
     
     strategy:
       matrix: