diff --git a/.gitattributes b/.gitattributes
index aa7854a..da20d18 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -3,4 +3,5 @@
 /.gitignore export-ignore
 /examples/ export-ignore
 /phpunit.xml.dist export-ignore
+/phpunit.xml.legacy export-ignore
 /tests/ export-ignore
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3558c27..38ed72e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -28,6 +28,9 @@ jobs:
           php-version: ${{ matrix.php }}
       - run: composer install
       - run: vendor/bin/phpunit --coverage-text
+        if: ${{ matrix.php >= 7.3 }}
+      - run: vendor/bin/phpunit --coverage-text -c phpunit.xml.legacy
+        if: ${{ matrix.php < 7.3 }}
 
   PHPUnit-hhvm:
     name: PHPUnit (HHVM)
@@ -38,4 +41,4 @@ jobs:
         with:
           version: lts-3.30
       - run: hhvm $(which composer) install
-      - run: hhvm vendor/bin/phpunit --coverage-text
+      - run: hhvm vendor/bin/phpunit
diff --git a/composer.json b/composer.json
index b190291..f51b9bb 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     },
     "require-dev": {
         "clue/hexdump": "0.2.*",
-        "phpunit/phpunit": "^9.0 ||^6.0 || ^5.7 || ^4.8.35"
+        "phpunit/phpunit": "^9.3 ||^6.0 || ^5.7 || ^4.8.35"
     },
     "suggest": {
         "ext-sockets": "Requires PHP 5.4+ and the low level socket API for listening on multicast addresses (socket options to send IGMP announcements)"
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index f80bbaa..ccf39fc 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,14 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit bootstrap="vendor/autoload.php" colors="true">
+<!-- PHPUnit configuration file with new format for PHPUnit 9.3+ -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true"
+         cacheResult="false">
     <testsuites>
-        <testsuite name="Multicast React Test Suite">
+        <testsuite name="Multicast test suite">
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory>./src/</directory>
-        </whitelist>
-    </filter>
-</phpunit>
\ No newline at end of file
+        </include>
+    </coverage>
+</phpunit>
diff --git a/phpunit.xml.legacy b/phpunit.xml.legacy
new file mode 100644
index 0000000..663909e
--- /dev/null
+++ b/phpunit.xml.legacy
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!-- PHPUnit configuration file with old format for PHPUnit 9.2 or older -->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/4.8/phpunit.xsd"
+         bootstrap="vendor/autoload.php"
+         colors="true">
+    <testsuites>
+        <testsuite name="Multicast test suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+        </whitelist>
+    </filter>
+</phpunit>