diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c3f828ffd..dbb2e9190 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -12,7 +12,6 @@ jobs:
 
         env:
             COMPOSER_ROOT_VERSION: 1.x-dev
-            SYMFONY_PHPUNIT_VERSION: 8.5
 
         strategy:
             matrix:
@@ -41,10 +40,12 @@ jobs:
                     tools: "composer:v2"
 
             -   name: Install dependencies
-                run: composer --prefer-source --no-progress --ansi install
+                run: |
+                    composer --prefer-source --no-progress --ansi install
+                    ./phpunit install
 
             -   name: Run tests
                 run: |
                     ok=0
-                    ./vendor/bin/simple-phpunit || ok=1
+                    ./phpunit || ok=1
                     [[ "${{ matrix.mode }}" = experimental ]] || (exit $ok)
diff --git a/.gitignore b/.gitignore
index a9246d0fd..b025ac2c9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,5 +3,6 @@
 .phpunit.result.cache
 composer.lock
 phpunit.xml
+.phpunit
 vendor/
 /tests/unicode
diff --git a/appveyor.yml b/appveyor.yml
index 9df8b9a65..93b8c784d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,8 +10,8 @@ cache:
 init:
     - SET PATH=c:\php;%PATH%
     - SET COMPOSER_NO_INTERACTION=1
+    - SET COMPOSER_ROOT_VERSION=1.x-dev
     - SET PHP=1
-    - SET SYMFONY_PHPUNIT_VERSION=8.5
 
 install:
     - cinst wget
@@ -41,8 +41,8 @@ install:
     - appveyor DownloadFile https://github.com/composer/composer/releases/download/2.7.9/composer.phar
     - cd c:\projects\polyfill
     - mkdir %APPDATA%\Composer && copy /Y .github\composer-config.json %APPDATA%\Composer\config.json
-    - SET COMPOSER_ROOT_VERSION=1.x-dev
     - composer update --prefer-source --no-progress --ansi
+    - php -d allow_url_fopen=0 ./phpunit install
 
 test_script:
-    - php -d allow_url_fopen=0 ./vendor/symfony/phpunit-bridge/bin/simple-phpunit
+    - php -d allow_url_fopen=0 ./phpunit
diff --git a/phpunit b/phpunit
new file mode 100755
index 000000000..82cf9caa3
--- /dev/null
+++ b/phpunit
@@ -0,0 +1,13 @@
+#!/usr/bin/env php
+<?php
+
+if (!file_exists(__DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit')) {
+    echo "Unable to find the `simple-phpunit` script in `vendor/symfony/phpunit-bridge/bin/`.\nPlease run `composer update` before running this command.\n";
+    exit(1);
+}
+if (!getenv('SYMFONY_PHPUNIT_VERSION')) {
+    putenv('SYMFONY_PHPUNIT_VERSION=8.5');
+}
+
+putenv('SYMFONY_PHPUNIT_DIR='.__DIR__.'/.phpunit');
+require __DIR__.'/vendor/symfony/phpunit-bridge/bin/simple-phpunit';
diff --git a/src/Apcu/bootstrap80.php b/src/Apcu/bootstrap80.php
index 69e9f1603..603196917 100644
--- a/src/Apcu/bootstrap80.php
+++ b/src/Apcu/bootstrap80.php
@@ -22,7 +22,7 @@ function apcu_delete($key): array|bool { return p\Apcu::apcu_delete($key); }
         function apcu_exists($key): array|bool { return p\Apcu::apcu_exists($key); }
     }
     if (!function_exists('apcu_fetch')) {
-        function apcu_fetch($key, &$success = null): mixed { return p\Apcu::apcu_fetch($key, $success); }
+        function apcu_fetch($key, &$success = null) { return p\Apcu::apcu_fetch($key, $success); }
     }
     if (!function_exists('apcu_store')) {
         function apcu_store($key, mixed $value, ?int $ttl = 0): array|bool { return p\Apcu::apcu_store($key, $value, (int) $ttl); }
diff --git a/src/Intl/Idn/Idn.php b/src/Intl/Idn/Idn.php
index 334f8ee70..448f74cef 100644
--- a/src/Intl/Idn/Idn.php
+++ b/src/Intl/Idn/Idn.php
@@ -145,6 +145,10 @@ final class Idn
      */
     public static function idn_to_ascii($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
     {
+        if (\PHP_VERSION_ID > 80400 && '' === $domainName) {
+            throw new \ValueError('idn_to_ascii(): Argument #1 ($domain) cannot be empty');
+        }
+
         if (self::INTL_IDNA_VARIANT_2003 === $variant) {
             @trigger_error('idn_to_ascii(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
         }
@@ -198,6 +202,10 @@ public static function idn_to_ascii($domainName, $options = self::IDNA_DEFAULT,
      */
     public static function idn_to_utf8($domainName, $options = self::IDNA_DEFAULT, $variant = self::INTL_IDNA_VARIANT_UTS46, &$idna_info = [])
     {
+        if (\PHP_VERSION_ID > 80400 && '' === $domainName) {
+            throw new \ValueError('idn_to_utf8(): Argument #1 ($domain) cannot be empty');
+        }
+
         if (self::INTL_IDNA_VARIANT_2003 === $variant) {
             @trigger_error('idn_to_utf8(): INTL_IDNA_VARIANT_2003 is deprecated', \E_USER_DEPRECATED);
         }
diff --git a/src/Mbstring/bootstrap80.php b/src/Mbstring/bootstrap80.php
index 5be7d2018..5236e6dcc 100644
--- a/src/Mbstring/bootstrap80.php
+++ b/src/Mbstring/bootstrap80.php
@@ -133,11 +133,11 @@ function mb_str_pad(string $string, int $length, string $pad_string = ' ', int $
 }
 
 if (!function_exists('mb_ucfirst')) {
-    function mb_ucfirst($string, ?string $encoding = null): string { return p\Mbstring::mb_ucfirst($string, $encoding); }
+    function mb_ucfirst(string $string, ?string $encoding = null): string { return p\Mbstring::mb_ucfirst($string, $encoding); }
 }
 
 if (!function_exists('mb_lcfirst')) {
-    function mb_lcfirst($string, ?string $encoding = null): string { return p\Mbstring::mb_lcfirst($string, $encoding); }
+    function mb_lcfirst(string $string, ?string $encoding = null): string { return p\Mbstring::mb_lcfirst($string, $encoding); }
 }
 
 if (!function_exists('mb_trim')) {
diff --git a/src/Php84/bootstrap.php b/src/Php84/bootstrap.php
index 73fb1f404..342158c63 100644
--- a/src/Php84/bootstrap.php
+++ b/src/Php84/bootstrap.php
@@ -41,11 +41,11 @@ function array_all(array $array, callable $callback): bool { return p\Php84::arr
 
 if (extension_loaded('mbstring')) {
     if (!function_exists('mb_ucfirst')) {
-        function mb_ucfirst($string, ?string $encoding = null): string { return p\Php84::mb_ucfirst($string, $encoding); }
+        function mb_ucfirst(string $string, ?string $encoding = null): string { return p\Php84::mb_ucfirst($string, $encoding); }
     }
 
     if (!function_exists('mb_lcfirst')) {
-        function mb_lcfirst($string, ?string $encoding = null): string { return p\Php84::mb_lcfirst($string, $encoding); }
+        function mb_lcfirst(string $string, ?string $encoding = null): string { return p\Php84::mb_lcfirst($string, $encoding); }
     }
 
     if (!function_exists('mb_trim')) {
diff --git a/src/Util/TestListenerTrait.php b/src/Util/TestListenerTrait.php
index 3b87d426d..5339d4f6e 100644
--- a/src/Util/TestListenerTrait.php
+++ b/src/Util/TestListenerTrait.php
@@ -123,6 +123,16 @@ function {$f['name']}{$f['signature']}
                     $polyfillSignature = ReflectionCaster::castFunctionAbstract(new \ReflectionFunction($testNamespace.'\\'.$f['name']), [], new Stub(), true);
                     $polyfillSignature = ReflectionCaster::getSignature($polyfillSignature);
 
+                    if ('mb_get_info' === $r->name && false === strpos($originalSignature, '|null') && false !== strpos($polyfillSignature, '|null')) {
+                        // Added to PHP 8.2.14/8.3.1
+                        $originalSignature .= '|null';
+                    }
+
+                    if (false === strpos($bootstrap->getPath(), '80.php')) {
+                        // mixed return type cannot be used before PHP 8
+                        $originalSignature = str_replace(': mixed', '', $originalSignature);
+                    }
+
                     $map = [
                         '?' => '',
                         'IDNA_DEFAULT' => \PHP_VERSION_ID >= 80100 ? 'IDNA_DEFAULT' : '0',
@@ -131,7 +141,7 @@ function {$f['name']}{$f['signature']}
                         'array|string|null $from_encoding' => 'array|string $from_encoding',
                     ];
 
-                    if (strtr($polyfillSignature, $map) !== $originalSignature) {
+                    if (strtr($polyfillSignature, $map) !== str_replace('?', '', $originalSignature)) {
                         $warnings[] = TestListener::warning("Incompatible signature for PHP >= 8:\n- {$f['name']}$originalSignature\n+ {$f['name']}$polyfillSignature");
                     }
                 }
diff --git a/tests/Compiler.php b/tests/Compiler.php
index bd61adc6e..85538460b 100644
--- a/tests/Compiler.php
+++ b/tests/Compiler.php
@@ -16,7 +16,7 @@
  * and charset data to a format suitable for other Utf8 classes.
  *
  * See https://unicode.org/Public/UNIDATA/ for unicode data
- * See https://github.com/unicode-org/cldr/blob/master/common/transforms/ for Latin-ASCII.xml
+ * See https://github.com/unicode-org/cldr/blob/main/common/transforms/ for Latin-ASCII.xml
  *
  * @author Nicolas Grekas <p@tchwork.com>
  *
diff --git a/tests/Intl/Icu/AbstractIntlDateFormatterTest.php b/tests/Intl/Icu/AbstractIntlDateFormatterTest.php
index 3e01dfa10..7761353e3 100644
--- a/tests/Intl/Icu/AbstractIntlDateFormatterTest.php
+++ b/tests/Intl/Icu/AbstractIntlDateFormatterTest.php
@@ -35,11 +35,11 @@ public function testConstructorDefaultTimeZone()
     {
         $formatter = $this->getDateFormatter('en', IntlDateFormatter::MEDIUM, IntlDateFormatter::SHORT);
 
-        $this->assertEquals(date_default_timezone_get(), $formatter->getTimeZoneId());
+        $this->assertSame(date_default_timezone_get(), $formatter->getTimeZoneId());
 
-        $this->assertEquals(
+        $this->assertSame(
             $this->getDateTime(0, $formatter->getTimeZoneId())->format('M j, Y, g:i A'),
-            $formatter->format(0)
+            str_replace("\u{202F}", ' ', $formatter->format(0))
         );
     }
 
@@ -50,7 +50,7 @@ public function testConstructorWithoutDateType()
     {
         $formatter = $this->getDateFormatter('en', null, IntlDateFormatter::SHORT, 'UTC', IntlDateFormatter::GREGORIAN);
 
-        $this->assertSame('EEEE, MMMM d, y \'at\' h:mm a', $formatter->getPattern());
+        $this->assertSame('EEEE, MMMM d, y \'at\' h:mm a', str_replace("\u{202F}", ' ', $formatter->getPattern()));
     }
 
     /**
@@ -60,7 +60,7 @@ public function testConstructorWithoutTimeType()
     {
         $formatter = $this->getDateFormatter('en', IntlDateFormatter::SHORT, null, 'UTC', IntlDateFormatter::GREGORIAN);
 
-        $this->assertSame('M/d/yy, h:mm:ss a zzzz', $formatter->getPattern());
+        $this->assertSame('M/d/yy, h:mm:ss a zzzz', str_replace("\u{202F}", ' ', $formatter->getPattern()));
     }
 
     /**
@@ -498,7 +498,11 @@ public function testFormatIgnoresPatternForRelativeDateType()
         $datetime = \DateTime::createFromFormat('U', time(), new \DateTimeZone('GMT'));
         $datetime->setTime(0, 0, 0);
 
-        $this->assertSame('today at 12:00:00 AM Greenwich Mean Time', $formatter->format($datetime));
+        $formatted = $formatter->format($datetime);
+        $formatted = str_replace(' at ', ', ', $formatted);
+        $formatted = str_replace("\u{202F}", ' ', $formatted);
+
+        $this->assertSame('today, 12:00:00 AM Greenwich Mean Time', $formatted);
     }
 
     /**
@@ -507,7 +511,7 @@ public function testFormatIgnoresPatternForRelativeDateType()
     public function testDateAndTimeType($timestamp, $datetype, $timetype, $expected)
     {
         $formatter = $this->getDateFormatter('en', $datetype, $timetype, 'UTC');
-        $this->assertSame($expected, $formatter->format($timestamp));
+        $this->assertSame($expected, str_replace("\u{202F}", ' ', $formatter->format($timestamp)));
     }
 
     public static function dateAndTimeTypeProvider()
@@ -533,7 +537,14 @@ public function testRelativeDateType($timestamp, $datetype, $timetype, $expected
         $datetime->setTime(0, 0, 0);
 
         $formatter = $this->getDateFormatter('en', $datetype, $timetype, 'UTC');
-        $this->assertSame($expected, $formatter->format($datetime));
+
+        $formatted = $formatter->format($datetime);
+
+        // Ignore differences that vary by version of PHP or ICU
+        $formatted = str_replace(' at ', ', ', $formatted);
+        $formatted = str_replace("\u{202F}", ' ', $formatted);
+
+        $this->assertSame($expected, $formatted);
     }
 
     public static function relativeDateTypeProvider()
@@ -545,17 +556,17 @@ public static function relativeDateTypeProvider()
             [0, IntlDateFormatter::RELATIVE_SHORT, IntlDateFormatter::NONE, '1/1/70'],
 
             [time(), IntlDateFormatter::RELATIVE_FULL, IntlDateFormatter::NONE, 'today'],
-            [time(), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'today at 12:00:00 AM Coordinated Universal Time'],
+            [time(), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'today, 12:00:00 AM Coordinated Universal Time'],
             [time(), IntlDateFormatter::RELATIVE_MEDIUM, IntlDateFormatter::LONG, 'today, 12:00:00 AM UTC'],
             [time(), IntlDateFormatter::RELATIVE_SHORT, IntlDateFormatter::SHORT, 'today, 12:00 AM'],
 
             [strtotime('-1 day', time()), IntlDateFormatter::RELATIVE_FULL, IntlDateFormatter::NONE, 'yesterday'],
-            [strtotime('-1 day', time()), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'yesterday at 12:00:00 AM Coordinated Universal Time'],
+            [strtotime('-1 day', time()), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'yesterday, 12:00:00 AM Coordinated Universal Time'],
             [strtotime('-1 day', time()), IntlDateFormatter::RELATIVE_MEDIUM, IntlDateFormatter::LONG, 'yesterday, 12:00:00 AM UTC'],
             [strtotime('-1 day', time()), IntlDateFormatter::RELATIVE_SHORT, IntlDateFormatter::SHORT, 'yesterday, 12:00 AM'],
 
             [strtotime('+1 day', time()), IntlDateFormatter::RELATIVE_FULL, IntlDateFormatter::NONE, 'tomorrow'],
-            [strtotime('+1 day', time()), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'tomorrow at 12:00:00 AM Coordinated Universal Time'],
+            [strtotime('+1 day', time()), IntlDateFormatter::RELATIVE_LONG, IntlDateFormatter::FULL, 'tomorrow, 12:00:00 AM Coordinated Universal Time'],
             [strtotime('+1 day', time()), IntlDateFormatter::RELATIVE_MEDIUM, IntlDateFormatter::LONG, 'tomorrow, 12:00:00 AM UTC'],
             [strtotime('+1 day', time()), IntlDateFormatter::RELATIVE_SHORT, IntlDateFormatter::SHORT, 'tomorrow, 12:00 AM'],
         ];
diff --git a/tests/Intl/Idn/IdnTest.php b/tests/Intl/Idn/IdnTest.php
index 1df884372..42cd76ae5 100644
--- a/tests/Intl/Idn/IdnTest.php
+++ b/tests/Intl/Idn/IdnTest.php
@@ -122,8 +122,12 @@ static function (array $matches): string {
      */
     public function testToUnicode($source, $toUnicode, $toUnicodeStatus, $toAsciiN, $toAsciiNStatus, $toAsciiT, $toAsciiTStatus)
     {
+        if (\PHP_VERSION_ID >= 80400 && '' === $source) {
+            $this->expectException(\ValueError::class);
+        }
+
         $options = \IDNA_CHECK_BIDI | \IDNA_CHECK_CONTEXTJ | \IDNA_USE_STD3_RULES | \IDNA_NONTRANSITIONAL_TO_UNICODE;
-        $result = idn_to_utf8($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
+        idn_to_utf8($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
 
         if (null === $info) {
             $this->markTestSkipped('PHP Bug #72506.');
@@ -151,7 +155,8 @@ public function testToUnicode($source, $toUnicode, $toUnicodeStatus, $toAsciiN,
     public function testToAsciiNonTransitional($source, $toUnicode, $toUnicodeStatus, $toAsciiN, $toAsciiNStatus, $toAsciiT, $toAsciiTStatus)
     {
         $options = \IDNA_CHECK_BIDI | \IDNA_CHECK_CONTEXTJ | \IDNA_USE_STD3_RULES | \IDNA_NONTRANSITIONAL_TO_ASCII;
-        $result = idn_to_ascii($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
+
+        idn_to_ascii($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
 
         if (null === $info) {
             $this->markTestSkipped('PHP Bug #72506.');
@@ -178,8 +183,12 @@ public function testToAsciiNonTransitional($source, $toUnicode, $toUnicodeStatus
      */
     public function testToAsciiTransitional($source, $toUnicode, $toUnicodeStatus, $toAsciiN, $toAsciiNStatus, $toAsciiT, $toAsciiTStatus)
     {
+        if (\PHP_VERSION_ID >= 80400 && '' === $source) {
+            $this->expectException(\ValueError::class);
+        }
+
         $options = \IDNA_CHECK_BIDI | \IDNA_CHECK_CONTEXTJ | \IDNA_USE_STD3_RULES;
-        $result = idn_to_ascii($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
+        idn_to_ascii($source, $options, \INTL_IDNA_VARIANT_UTS46, $info);
 
         if (null === $info) {
             $this->markTestSkipped('PHP Bug #72506.');
diff --git a/tests/Mbstring/MbstringTest.php b/tests/Mbstring/MbstringTest.php
index 75bb3be00..bacaf3dbe 100644
--- a/tests/Mbstring/MbstringTest.php
+++ b/tests/Mbstring/MbstringTest.php
@@ -729,9 +729,9 @@ public static function paddingEncodingProvider(): iterable
 
     public static function mbStrPadInvalidArgumentsProvider(): iterable
     {
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_RIGHT];
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_LEFT];
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_BOTH];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_RIGHT];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_LEFT];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_BOTH];
         yield ['mb_str_pad(): Argument #4 ($pad_type) must be STR_PAD_LEFT, STR_PAD_RIGHT, or STR_PAD_BOTH', '▶▶', 6, ' ', 123456];
         yield ['mb_str_pad(): Argument #5 ($encoding) must be a valid encoding, "unexisting" given', '▶▶', 6, ' ', \STR_PAD_BOTH, 'unexisting'];
     }
diff --git a/tests/Php74/Php74Test.php b/tests/Php74/Php74Test.php
index 8a4123429..44a17c995 100644
--- a/tests/Php74/Php74Test.php
+++ b/tests/Php74/Php74Test.php
@@ -123,11 +123,13 @@ class A
     private $priv = 3;
 }
 
+#[\AllowDynamicProperties]
 class B extends A
 {
     private $priv = 4;
 }
 
+#[\AllowDynamicProperties]
 class AO extends \ArrayObject
 {
     private $priv = 1;
diff --git a/tests/Php83/Php83Test.php b/tests/Php83/Php83Test.php
index 08416a9af..545a8fdc1 100644
--- a/tests/Php83/Php83Test.php
+++ b/tests/Php83/Php83Test.php
@@ -115,9 +115,9 @@ public static function paddingEncodingProvider(): iterable
 
     public static function mbStrPadInvalidArgumentsProvider(): iterable
     {
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_RIGHT];
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_LEFT];
-        yield ['mb_str_pad(): Argument #3 ($pad_string) must be a non-empty string', '▶▶', 6, '', \STR_PAD_BOTH];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_RIGHT];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_LEFT];
+        yield ['mb_str_pad(): Argument #3 ($pad_string)', '▶▶', 6, '', \STR_PAD_BOTH];
         yield ['mb_str_pad(): Argument #4 ($pad_type) must be STR_PAD_LEFT, STR_PAD_RIGHT, or STR_PAD_BOTH', '▶▶', 6, ' ', 123456];
         yield ['mb_str_pad(): Argument #5 ($encoding) must be a valid encoding, "unexisting" given', '▶▶', 6, ' ', \STR_PAD_BOTH, 'unexisting'];
     }
@@ -280,7 +280,7 @@ public function testInvalidStrIncrement(string $errorMessage, string $string)
 
     public static function strInvalidIncrementProvider(): iterable
     {
-        yield ['str_increment(): Argument #1 ($string) cannot be empty', ''];
+        yield ['str_increment(): Argument #1 ($string)', ''];
         yield ['str_increment(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters', '-cc'];
         yield ['str_increment(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters', 'Z '];
         yield ['str_increment(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters', ' Z'];
@@ -311,7 +311,7 @@ public function testInvalidStrDecrement(string $errorMessage, string $string)
 
     public static function strInvalidDecrementProvider(): iterable
     {
-        yield ['str_decrement(): Argument #1 ($string) cannot be empty', ''];
+        yield ['str_decrement(): Argument #1 ($string)', ''];
         yield ['str_decrement(): Argument #1 ($string) must be composed only of alphanumeric ASCII characters', '我喜歡雞肉'];
         yield ['str_decrement(): Argument #1 ($string) "0" is out of decrement range', '0'];
         yield ['str_decrement(): Argument #1 ($string) "a" is out of decrement range', 'a'];
diff --git a/tests/update-unidata.php b/tests/update-unidata.php
index 1ce8c3863..10b082f93 100755
--- a/tests/update-unidata.php
+++ b/tests/update-unidata.php
@@ -21,7 +21,7 @@
     file_put_contents(__DIR__.'/unicode/data/'.$file, $data);
 }
 
-$data = file_get_contents('https://github.com/unicode-org/cldr/raw/master/common/transforms/Latin-ASCII.xml');
+$data = file_get_contents('https://github.com/unicode-org/cldr/raw/main/common/transforms/Latin-ASCII.xml');
 file_put_contents(__DIR__.'/unicode/data/Latin-ASCII.xml', $data);
 
 Compiler::translitMap(__DIR__.'/../src/Iconv/Resources/charset/');