diff --git a/.gitattributes b/.gitattributes
index 982c460d..e9da46b9 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -2,4 +2,5 @@
 /.gitignore export-ignore
 /.travis.yml export-ignore
 /phpunit.xml.dist export-ignore
+/phpunit.xml.legacy export-ignore
 /tests export-ignore
diff --git a/.travis.yml b/.travis.yml
index db571d1c..a22e64cf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -21,7 +21,8 @@ install:
   - composer install
 
 script:
-  - ./vendor/bin/phpunit -v --coverage-text --coverage-clover=./build/logs/clover.xml
+  - if [[ "$TRAVIS_PHP_VERSION" > "7.2" ]]; then vendor/bin/phpunit --coverage-text --coverage-clover=./build/logs/clover.xml; fi
+  - if [[ "$TRAVIS_PHP_VERSION" < "7.3" ]]; then vendor/bin/phpunit --coverage-text -c phpunit.xml.legacy --coverage-clover=./build/logs/clover.xml; fi
 
 after_script:
   - if [ -f ./build/logs/clover.xml ]; then travis_retry composer require satooshi/php-coveralls --no-interaction --update-with-dependencies; fi
diff --git a/composer.json b/composer.json
index 0c01d6cf..b991a256 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         "php": ">=5.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.0 || ^5.7 || ^4.8.36"
+        "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.36"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 0b97c746..3ccce487 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,18 +1,22 @@
 <?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="Promise Test Suite">
             <directory>./tests/</directory>
         </testsuite>
     </testsuites>
-
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory>./src/</directory>
             <exclude>
                 <file>./src/functions_include.php</file>
             </exclude>
-        </whitelist>
-    </filter>
+        </include>
+    </coverage>
 </phpunit>
diff --git a/phpunit.xml.legacy b/phpunit.xml.legacy
new file mode 100644
index 00000000..84ac9123
--- /dev/null
+++ b/phpunit.xml.legacy
@@ -0,0 +1,21 @@
+<?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="Promise Test Suite">
+            <directory>./tests/</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+            <exclude>
+                <file>./src/functions_include.php</file>
+            </exclude>
+        </whitelist>
+    </filter>
+</phpunit>
diff --git a/tests/PromiseTest/NotifyTestTrait.php b/tests/PromiseTest/NotifyTestTrait.php
index 4501df67..5b740652 100644
--- a/tests/PromiseTest/NotifyTestTrait.php
+++ b/tests/PromiseTest/NotifyTestTrait.php
@@ -235,14 +235,10 @@ public function notifyShouldAllowResolveAfterProgress()
         $adapter = $this->getPromiseTestAdapter();
 
         $mock = $this->createCallableMock();
-        $mock
-            ->expects($this->at(0))
-            ->method('__invoke')
-            ->with($this->identicalTo(1));
-        $mock
-            ->expects($this->at(1))
-            ->method('__invoke')
-            ->with($this->identicalTo(2));
+        $mock->expects($this->exactly(2))->method('__invoke')->withConsecutive(
+            array($this->identicalTo(1)),
+            array($this->identicalTo(2))
+        );
 
         $adapter->promise()
             ->then(
@@ -261,14 +257,10 @@ public function notifyShouldAllowRejectAfterProgress()
         $adapter = $this->getPromiseTestAdapter();
 
         $mock = $this->createCallableMock();
-        $mock
-            ->expects($this->at(0))
-            ->method('__invoke')
-            ->with($this->identicalTo(1));
-        $mock
-            ->expects($this->at(1))
-            ->method('__invoke')
-            ->with($this->identicalTo(2));
+        $mock->expects($this->exactly(2))->method('__invoke')->withConsecutive(
+            array($this->identicalTo(1)),
+            array($this->identicalTo(2))
+        );
 
         $adapter->promise()
             ->then(