Prepare release

Author: sebastianbergmann

ChangeLog-9.6.md

@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 9.6 release series are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
+## [9.6.18] - 2024-03-21
+
+### Changed
+
+* [#5763](https://github.com/sebastianbergmann/phpunit/issues/5763): Release nullable type changes for PHPUnit 9.6
+
 ## [9.6.17] - 2024-02-23
 
 ### Changed
@@ -131,6 +137,7 @@ All notable changes of the PHPUnit 9.6 release series are documented in this fil
 * [#5064](https://github.com/sebastianbergmann/phpunit/issues/5064): Deprecate `PHPUnit\Framework\TestCase::getMockClass()`
 * [#5132](https://github.com/sebastianbergmann/phpunit/issues/5132): Deprecate `Test` suffix for abstract test case classes
 
+[9.6.18]: https://github.com/sebastianbergmann/phpunit/compare/9.6.17...9.6.18
 [9.6.17]: https://github.com/sebastianbergmann/phpunit/compare/9.6.16...9.6.17
 [9.6.16]: https://github.com/sebastianbergmann/phpunit/compare/9.6.15...9.6.16
 [9.6.15]: https://github.com/sebastianbergmann/phpunit/compare/9.6.14...9.6.15

src/Runner/Version.php

@@ -44,7 +44,7 @@ public static function id(): string
         }
 
         if (self::$version === '') {
-            self::$version = (new VersionId('9.6.17', dirname(__DIR__, 2)))->getVersion();
+            self::$version = (new VersionId('9.6.18', dirname(__DIR__, 2)))->getVersion();
 
             assert(!empty(self::$version));
         }