diff --git a/.github/workflows/woo.yml b/.github/workflows/woo.yml
index 6972dc8..fa12b9a 100644
--- a/.github/workflows/woo.yml
+++ b/.github/workflows/woo.yml
@@ -34,11 +34,11 @@ jobs:
           - php-version: '7.4'
             wp: '5.3'
             wc: '5.4.3'
-            phpunit: 'phpunit:8.2.3'
+            phpunit: 'phpunit:7.5.20'
           - php-version: '7.4'
             wp: '5.3'
             wc: '6.4.0'
-            phpunit: 'phpunit:8.2.3'
+            phpunit: 'phpunit:7.5.20'
 
           # WordPress 6.0
           # PHP 7.0 and 7.4
@@ -53,11 +53,11 @@ jobs:
           - php-version: '7.4'
             wp: '6.0'
             wc: '5.4.3'
-            phpunit: 'phpunit:8.2.3'
+            phpunit: 'phpunit:7.5.20'
           - php-version: '7.4'
             wp: '6.0'
             wc: '6.4.0'
-            phpunit: 'phpunit:8.2.3'
+            phpunit: 'phpunit:7.5.20'
     services:
       mysql:
         image: mysql:5.7