diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index b07865b7..ba5abb0d 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -73,9 +73,9 @@ jobs:
       # do not stop on another job's failure
       fail-fast: false
       matrix:
-        php-versions: ['7.4']
+        php-versions: ['8.1']
         databases: ['mysql']
-        server-versions: ['master']
+        server-versions: ['stable25']
 
     name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
 
@@ -138,9 +138,9 @@ jobs:
       # do not stop on another job's failure
       fail-fast: false
       matrix:
-        php-versions: ['7.4']
+        php-versions: ['8.1']
         databases: ['pgsql']
-        server-versions: ['master']
+        server-versions: ['stable25']
 
     name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}
 
@@ -205,9 +205,9 @@ jobs:
       # do not stop on another job's failure
       fail-fast: false
       matrix:
-        php-versions: ['7.4']
+        php-versions: ['8.1']
         databases: ['oci']
-        server-versions: ['master']
+        server-versions: ['stable25']
 
     name: php${{ matrix.php-versions }}-${{ matrix.databases }}-${{ matrix.server-versions }}