diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f9d55b5..c149ce1 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   run-tests:
     name: PHP ${{ matrix.php-versions }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     env:
       extensions: mbstring, intl, json, phalcon4, redis, swoole, xdebug
       key: cache-v0.0.2