diff --git a/src/Inspector/Settings/TargetPhpSettings/TargetPhpSettings.php b/src/Inspector/Settings/TargetPhpSettings/TargetPhpSettings.php
index 20d096eb..94522669 100644
--- a/src/Inspector/Settings/TargetPhpSettings/TargetPhpSettings.php
+++ b/src/Inspector/Settings/TargetPhpSettings/TargetPhpSettings.php
@@ -15,6 +15,7 @@
 
 use PhpProfiler\Lib\PhpInternals\ZendTypeReader;
 
+/** @psalm-immutable */
 final class TargetPhpSettings
 {
     public const PHP_REGEX_DEFAULT = '.*/(php(74|7.4|80|8.0)?|php-fpm|libphp[78]?.*\.so)$';
@@ -23,13 +24,38 @@ final class TargetPhpSettings
 
     /** @param value-of<ZendTypeReader::ALL_SUPPORTED_VERSIONS> $php_version */
     public function __construct(
-        public string $php_regex = self::PHP_REGEX_DEFAULT,
-        public string $libpthread_regex = self::LIBPTHREAD_REGEX_DEFAULT,
+        private string $php_regex = self::PHP_REGEX_DEFAULT,
+        private string $libpthread_regex = self::LIBPTHREAD_REGEX_DEFAULT,
         public string $php_version = self::TARGET_PHP_VERSION_DEFAULT,
         public ?string $php_path = null,
         public ?string $libpthread_path = null
     ) {
-        $this->php_regex = '{' . $php_regex . '}';
-        $this->libpthread_regex = '{' . $libpthread_regex . '}';
+    }
+
+    public function getDelimitedPhpRegex(): string
+    {
+        return $this->getDelimitedRegex($this->php_regex);
+    }
+
+    public function getDelimitedLibPthreadRegex(): string
+    {
+        return $this->getDelimitedRegex($this->libpthread_regex);
+    }
+
+    private function getDelimitedRegex(string $regex): string
+    {
+        return '{' . $regex . '}';
+    }
+
+    /** @param value-of<ZendTypeReader::ALL_SUPPORTED_VERSIONS> $php_version */
+    public function alterPhpVersion(string $php_version): self
+    {
+        return new self(
+            php_regex: $this->php_regex,
+            libpthread_regex: $this->libpthread_regex,
+            php_version: $php_version,
+            php_path: $this->php_path,
+            libpthread_path: $this->libpthread_path,
+        );
     }
 }
diff --git a/src/Lib/PhpProcessReader/PhpGlobalsFinder.php b/src/Lib/PhpProcessReader/PhpGlobalsFinder.php
index 7b5a177a..9ce1eefe 100644
--- a/src/Lib/PhpProcessReader/PhpGlobalsFinder.php
+++ b/src/Lib/PhpProcessReader/PhpGlobalsFinder.php
@@ -69,8 +69,8 @@ public function getSymbolReader(
     ): ProcessSymbolReaderInterface {
         return $this->php_symbol_reader_creator->create(
             $process_specifier->pid,
-            $target_php_settings->php_regex,
-            $target_php_settings->libpthread_regex,
+            $target_php_settings->getDelimitedPhpRegex(),
+            $target_php_settings->getDelimitedLibPthreadRegex(),
             $target_php_settings->php_path,
             $target_php_settings->libpthread_path
         );
diff --git a/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsFromConsoleInputTest.php b/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsFromConsoleInputTest.php
index 2f26b3a4..dcac1a26 100644
--- a/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsFromConsoleInputTest.php
+++ b/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsFromConsoleInputTest.php
@@ -30,8 +30,8 @@ public function testFromConsoleInput(): void
 
         $settings = (new TargetPhpSettingsFromConsoleInput())->createSettings($input);
 
-        $this->assertSame('{abc}', $settings->php_regex);
-        $this->assertSame('{def}', $settings->libpthread_regex);
+        $this->assertSame('{abc}', $settings->getDelimitedPhpRegex());
+        $this->assertSame('{def}', $settings->getDelimitedLibPthreadRegex());
         $this->assertSame('v74', $settings->php_version);
         $this->assertSame('ghi', $settings->php_path);
         $this->assertSame('jkl', $settings->libpthread_path);
diff --git a/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsTest.php b/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsTest.php
new file mode 100644
index 00000000..c62914e6
--- /dev/null
+++ b/tests/Inspector/Settings/TargetPhpSettings/TargetPhpSettingsTest.php
@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * This file is part of the sj-i/php-profiler package.
+ *
+ * (c) sji <sji@sj-i.dev>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace PhpProfiler\Inspector\Settings\TargetPhpSettings;
+
+use PhpProfiler\Lib\PhpInternals\ZendTypeReader;
+use PHPUnit\Framework\TestCase;
+
+class TargetPhpSettingsTest extends TestCase
+{
+    public function testAlterPhpVersion(): void
+    {
+        $settings = new TargetPhpSettings(
+            php_version: ZendTypeReader::V74,
+        );
+        $settings_altered = $settings->alterPhpVersion(ZendTypeReader::V81);
+        $this->assertSame($settings->php_path, $settings_altered->php_path);
+        $this->assertSame($settings->getDelimitedPhpRegex(), $settings_altered->getDelimitedPhpRegex());
+        $this->assertSame($settings->libpthread_path, $settings_altered->libpthread_path);
+        $this->assertSame($settings->getDelimitedLibPthreadRegex(), $settings_altered->getDelimitedLibPthreadRegex());
+        $this->assertSame(ZendTypeReader::V81, $settings_altered->php_version);
+    }
+
+    public function testGetDelimitedPhpRegex(): void
+    {
+        $settings = new TargetPhpSettings(
+            php_regex: 'test',
+        );
+        $this->assertSame('{test}', $settings->getDelimitedPhpRegex());
+    }
+
+    public function testGetDelimitedLibPthreadRegex(): void
+    {
+        $settings = new TargetPhpSettings(
+            libpthread_regex: 'test',
+        );
+        $this->assertSame('{test}', $settings->getDelimitedLibPthreadRegex());
+    }
+}