diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 885fe3d3945..70717843640 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -25,6 +25,7 @@ jobs:
           - "8.0"
           - "8.1"
           - "8.2"
+          - "8.3"
         php_invoker: [true, false]
         coverage: [false]
         experimental: [false]
@@ -39,21 +40,32 @@ jobs:
 
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Setup PHP ${{ matrix.php }}
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
-          ini-values: display_errors=off, log_errors=on
+          # setup-php defaults to production ini which excludes E_DEPRECATED,
+          # override to catch deprecation warnings in tests
+          ini-values: error_reporting=E_ALL, display_errors=on, log_errors=on
           extensions: xdebug, ctype, dom, json, pcre, reflection, spl
-          # Since "The PEAR repository has been removed from Composer 2.0" it makes "composer install" to fail on this repo
-          # revert to composer v1 (and run it outside the checkouted repo, because composer v2 is basically stuck on that error on any command)
-          tools: composer:v1
+          tools: composer
         env:
           # https://github.com/shivammathur/setup-php/issues/407#issuecomment-773675741
           fail-fast: true
 
+      # PEAR_RunTest is needed for .phpt tests. The composer v2 packagist version
+      # of pear/pear requires PHP 5.4+, and the PHP 5.3-compatible version that was
+      # previously installable via composer v1 is no longer available since packagist
+      # dropped composer v1 support. Install via pear CLI provided by setup-php instead.
+      #
+      # pear install without sudo fails on PHP 5.6+ with "php_dir is not writeable"
+      # because setup-php creates root-owned PEAR directories for those versions.
+      # pear channel-update is needed to avoid "channel has updated its protocols" warning.
+      - name: Install PEAR
+        run: sudo pear channel-update pear.php.net && sudo pear install --force PEAR
+
       - name: Install dependencies
         env:
           INSTALL_PHP_INVOKER: "${{ matrix.php_invoker == true }}"
diff --git a/PHPUnit/Extensions/PhptTestCase.php b/PHPUnit/Extensions/PhptTestCase.php
index bb66bdc23eb..ccbe8821228 100644
--- a/PHPUnit/Extensions/PhptTestCase.php
+++ b/PHPUnit/Extensions/PhptTestCase.php
@@ -44,9 +44,7 @@
  */
 
 if (stream_resolve_include_path('PEAR/RunTest.php')) {
-    $currentErrorReporting = error_reporting(E_ERROR | E_WARNING | E_PARSE);
     require_once 'PEAR/RunTest.php';
-    error_reporting($currentErrorReporting);
 }
 
 /**
@@ -122,7 +120,8 @@ public function count()
     public function run(PHPUnit_Framework_TestResult $result = NULL, array $options = array())
     {
         if (!class_exists('PEAR_RunTest', FALSE)) {
-            throw new PHPUnit_Framework_Exception('Class PEAR_RunTest not found.');
+            $result->addFailure($this, new PHPUnit_Framework_SkippedTestError('PEAR_RunTest not available'), 0);
+            return $result;
         }
 
         if (isset($GLOBALS['_PEAR_destructor_object_list']) &&
diff --git a/PHPUnit/Util/GlobalState.php b/PHPUnit/Util/GlobalState.php
index 08457fd89ed..008e691e98c 100644
--- a/PHPUnit/Util/GlobalState.php
+++ b/PHPUnit/Util/GlobalState.php
@@ -107,6 +107,10 @@ public static function backupGlobals(array $blacklist)
             }
         }
 
+        // skip PEAR globals to avoid "Creation of dynamic property" deprecation
+        // on PHP 8.2+ when unserializing PEAR_Registry objects
+        $blacklist[] = '_PEAR_Config_instance';
+
         foreach (array_keys($GLOBALS) as $key) {
             if ($key != 'GLOBALS' &&
                 !in_array($key, $superGlobalArrays) &&
@@ -133,6 +137,9 @@ public static function restoreGlobals(array $blacklist)
             }
         }
 
+        // skip PEAR globals (see comment in backupGlobals)
+        $blacklist[] = '_PEAR_Config_instance';
+
         foreach (array_keys($GLOBALS) as $key) {
             if ($key != 'GLOBALS' &&
                 !in_array($key, $superGlobalArrays) &&
@@ -343,7 +350,8 @@ public static function restoreStaticAttributes()
             foreach ($staticAttributes as $name => $value) {
                 $reflector = new ReflectionProperty($className, $name);
                 $reflector->setAccessible(TRUE);
-                $reflector->setValue(unserialize($value));
+                // two-arg form: single-arg setValue() for static properties is deprecated in PHP 8.3
+                $reflector->setValue(null, unserialize($value));
             }
         }
 
diff --git a/README.md b/README.md
index c7f1c2f8493..07921b2c32f 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
-# PHPUnit 3.7.x php 5.3-8.2 compatible
+# PHPUnit 3.7.x php 5.3-8.3 compatible
 
-This version of PHPUnit bases on release 3.7.38 and is adjusted for compatibility with PHP 5.3-8.2.
+This version of PHPUnit bases on release 3.7.38 and is adjusted for compatibility with PHP 5.3-8.3.
 The package was created especially for testing https://github.com/zf1s packages.
 
 All credits go to original PHPUnit author and contributors.
diff --git a/Tests/Framework/AssertTest.php b/Tests/Framework/AssertTest.php
index b57055f4bd1..5517d48fc31 100644
--- a/Tests/Framework/AssertTest.php
+++ b/Tests/Framework/AssertTest.php
@@ -66,6 +66,7 @@
 class Framework_AssertTest extends PHPUnit_Framework_TestCase
 {
     protected $filesDirectory;
+    protected $html;
 
     protected function setUp()
     {
diff --git a/composer.json b/composer.json
index 0bd52ed7d03..eeba5c0a9f5 100644
--- a/composer.json
+++ b/composer.json
@@ -25,12 +25,6 @@
     "support": {
         "issues": "https://github.com/zf1s/phpunit/issues"
     },
-    "repositories": [
-        {
-            "type": "pear",
-            "url": "https://pear.php.net"
-        }
-    ],
     "require": {
         "php": ">=5.3.3",
         "phpunit/php-text-template": "^1.2.1",
@@ -46,9 +40,7 @@
         "ext-reflection": "*",
         "ext-spl": "*"
     },
-    "require-dev": {
-        "pear-pear.php.net/pear": "~1.9|~1.10"
-    },
+    "require-dev": {},
     "suggest": {
         "phpunit/php-invoker": "~1.1"
     },