diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 8ebf9925..b9a37d56 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -6,7 +6,7 @@ parameters:
 			path: src/Options.php
 
 		-
-			message: "#^Parameter \\#7 \\$phpunitOptions of class ParaTest\\\\Options constructor expects array\\<non\\-empty\\-string, non\\-empty\\-string\\|true\\>, array\\<'bootstrap'\\|'cache\\-directory'\\|'configuration'\\|'coverage\\-filter'\\|'disallow\\-test\\-output'\\|'dont\\-report\\-useless…'\\|'exclude\\-group'\\|'fail\\-on\\-incomplete'\\|'fail\\-on\\-risky'\\|'fail\\-on\\-skipped'\\|'fail\\-on\\-warning'\\|'filter'\\|'group'\\|'no\\-configuration'\\|'order\\-by'\\|'random\\-order\\-seed'\\|'stop\\-on\\-defect'\\|'stop\\-on\\-error'\\|'stop\\-on\\-incomplete'\\|'stop\\-on\\-risky'\\|'stop\\-on\\-skipped'\\|'stop\\-on\\-warning'\\|'strict\\-coverage'\\|'strict\\-global\\-state', non\\-empty\\-array\\|float\\|int\\<min, \\-1\\>\\|int\\<1, max\\>\\|non\\-falsy\\-string\\|true\\> given\\.$#"
+			message: "#^Parameter \\#7 \\$phpunitOptions of class ParaTest\\\\Options constructor expects array\\<non\\-empty\\-string, non\\-empty\\-string\\|true\\>, array\\<'bootstrap'\\|'cache\\-directory'\\|'configuration'\\|'coverage\\-filter'\\|'disallow\\-test\\-output'\\|'dont\\-report\\-useless…'\\|'exclude\\-group'\\|'fail\\-on\\-incomplete'\\|'fail\\-on\\-risky'\\|'fail\\-on\\-skipped'\\|'fail\\-on\\-warning'\\|'filter'\\|'group'\\|'no\\-configuration'\\|'order\\-by'\\|'process\\-isolation'\\|'random\\-order\\-seed'\\|'stop\\-on\\-defect'\\|'stop\\-on\\-error'\\|'stop\\-on\\-incomplete'\\|'stop\\-on\\-risky'\\|'stop\\-on\\-skipped'\\|'stop\\-on\\-warning'\\|'strict\\-coverage'\\|'strict\\-global\\-state', non\\-empty\\-array\\|float\\|int\\<min, \\-1\\>\\|int\\<1, max\\>\\|non\\-falsy\\-string\\|true\\> given\\.$#"
 			count: 1
 			path: src/Options.php
 
diff --git a/src/Options.php b/src/Options.php
index ef6faeb7..76ff4672 100644
--- a/src/Options.php
+++ b/src/Options.php
@@ -64,6 +64,7 @@ final class Options
         'group' => true,
         'no-configuration' => true,
         'order-by' => true,
+        'process-isolation' => true,
         'random-order-seed' => true,
         'stop-on-defect' => true,
         'stop-on-error' => true,
@@ -309,11 +310,17 @@ public static function setInputDefinition(InputDefinition $inputDefinition): voi
                 '@see PHPUnit guide, chapter: ' . $chapter,
             ),
             new InputOption(
-                'strict-coverage',
+                'process-isolation',
                 null,
                 InputOption::VALUE_NONE,
                 '@see PHPUnit guide, chapter: ' . $chapter = 'Execution',
             ),
+            new InputOption(
+                'strict-coverage',
+                null,
+                InputOption::VALUE_NONE,
+                '@see PHPUnit guide, chapter: ' . $chapter,
+            ),
             new InputOption(
                 'strict-global-state',
                 null,
diff --git a/test/Unit/WrapperRunner/WrapperRunnerTest.php b/test/Unit/WrapperRunner/WrapperRunnerTest.php
index 85f16df5..53a9046e 100644
--- a/test/Unit/WrapperRunner/WrapperRunnerTest.php
+++ b/test/Unit/WrapperRunner/WrapperRunnerTest.php
@@ -495,4 +495,13 @@ public function testHandleCollisionWithSymfonyOutput(): void
         $runnerResult = $this->runRunner();
         self::assertStringContainsString('<bg=%s>', $runnerResult->output);
     }
+
+    public function testProcessIsolation(): void
+    {
+        $this->bareOptions['path']                = $this->fixture('process_isolation' . DIRECTORY_SEPARATOR . 'FooTest.php');
+        $this->bareOptions['--process-isolation'] = true;
+
+        $runnerResult = $this->runRunner();
+        self::assertEquals(0, $runnerResult->exitCode);
+    }
 }
diff --git a/test/fixtures/process_isolation/FooTest.php b/test/fixtures/process_isolation/FooTest.php
new file mode 100644
index 00000000..83d2c2f4
--- /dev/null
+++ b/test/fixtures/process_isolation/FooTest.php
@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ParaTest\Tests\fixtures\process_isolation;
+
+use PHPUnit\Framework\TestCase;
+
+use function getenv;
+use function putenv;
+
+/** @internal */
+final class FooTest extends TestCase
+{
+    public function test1(): void
+    {
+        putenv('PROC_ISOLATION=myuniqvalue');
+
+        self::assertNotFalse(getenv('PROC_ISOLATION'));
+    }
+
+    public function test2(): void
+    {
+        self::assertFalse(getenv('PROC_ISOLATION'));
+    }
+}