diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 0651092..e6be02e 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -4,7 +4,7 @@ on: [push]
 
 jobs:
   build-test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
       - uses: actions/checkout@v2
@@ -12,7 +12,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@2.7.0
         with:
-          php-version: '7.3'
+          php-version: '7.4'
           tools: phpunit
           extension: mbstring, intl, simplexml, dom, 
           ini-values: post_max_size=256M, short_open_tag=On