diff --git a/composer.json b/composer.json
index d8642057..502b23c2 100644
--- a/composer.json
+++ b/composer.json
@@ -8,9 +8,9 @@
     },
     "require-dev": {
         "rector/rector-src": "dev-main",
-        "phpunit/phpunit": "^11.4",
-        "phpstan/phpstan": "^2.0",
-        "symplify/easy-coding-standard": "^12.3",
+        "phpunit/phpunit": "^11.5",
+        "phpstan/phpstan": "^2.1",
+        "phpecs/phpecs": "^2.0",
         "phpstan/extension-installer": "^1.4",
         "symplify/vendor-patches": "^11.3",
         "tracy/tracy": "^2.10",
diff --git a/rules-tests/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector/Fixture/include_str_contains.php.inc b/rules-tests/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector/Fixture/include_str_contains.php.inc
new file mode 100644
index 00000000..dadc55ca
--- /dev/null
+++ b/rules-tests/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector/Fixture/include_str_contains.php.inc
@@ -0,0 +1,31 @@
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertTrueFalseToSpecificMethodRector\Fixture;
+
+final class IncludeStrContains extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $this->assertTrue(str_contains('haystack', 'needle'));
+
+        $this->assertFalse(str_contains('haystack 2', 'needle 2'));
+    }
+}
+
+?>
+-----
+<?php
+
+namespace Rector\PHPUnit\Tests\CodeQuality\Rector\MethodCall\AssertTrueFalseToSpecificMethodRector\Fixture;
+
+final class IncludeStrContains extends \PHPUnit\Framework\TestCase
+{
+    public function test()
+    {
+        $this->assertStringContainsString('needle', 'haystack');
+
+        $this->assertStringNotContainsString('needle 2', 'haystack 2');
+    }
+}
+
+?>
diff --git a/rules/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector.php b/rules/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector.php
index 824ea245..0b2d8604 100644
--- a/rules/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector.php
+++ b/rules/CodeQuality/Rector/MethodCall/AssertTrueFalseToSpecificMethodRector.php
@@ -39,6 +39,7 @@ final class AssertTrueFalseToSpecificMethodRector extends AbstractRector
         'is_writable' => ['is_writable', 'assertIsWritable', 'assertNotIsWritable'],
         'is_nan' => ['is_nan', 'assertNan', ''],
         'is_a' => ['is_a', 'assertInstanceOf', 'assertNotInstanceOf'],
+        'str_contains' => ['str_contains', 'assertStringContainsString', 'assertStringNotContainsString'],
     ];
 
     public function __construct(
@@ -214,7 +215,8 @@ private function buildNewArguments(
             return [...$funcCallOrEmptyNodeArgs, ...$oldArguments];
         }
 
-        if ($funcCallOrEmptyNodeName === 'is_a') {
+        if (in_array($funcCallOrEmptyNodeName, ['is_a', 'str_contains'], true)) {
+            // flip arguments
             $newArgs = [$funcCallOrEmptyNodeArgs[1], $funcCallOrEmptyNodeArgs[0]];
 
             return [...$newArgs, ...$oldArguments];