diff --git a/composer.json b/composer.json
index fa3d55e..38b2eac 100644
--- a/composer.json
+++ b/composer.json
@@ -10,7 +10,7 @@
         "phpstan/phpdoc-parser": "^2.3",
         "phpstan/phpstan": "^2.2.1",
         "ruudk/code-generator": "^0.4.7",
-        "sebastian/diff": "^7 || ^8",
+        "sebastian/diff": "^7 || ^8 || ^9",
         "symfony/console": "^8.0",
         "symfony/filesystem": "^8.0",
         "symfony/finder": "^8.0",
diff --git a/composer.lock b/composer.lock
index 2e774ab..4f4c381 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "26b9c3500b8cb4419daee2a525cb18a0",
+    "content-hash": "b26b6a5ecedb3454536f2968ffa49817",
     "packages": [
         {
             "name": "nikic/php-parser",
@@ -292,16 +292,16 @@
         },
         {
             "name": "sebastian/diff",
-            "version": "8.1.0",
+            "version": "8.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "9c957d730257f49c873f3761674559bd90098a7d"
+                "reference": "b36d33b6e796513de7cb7df053afb3f55eefcd47"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/9c957d730257f49c873f3761674559bd90098a7d",
-                "reference": "9c957d730257f49c873f3761674559bd90098a7d",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/b36d33b6e796513de7cb7df053afb3f55eefcd47",
+                "reference": "b36d33b6e796513de7cb7df053afb3f55eefcd47",
                 "shasum": ""
             },
             "require": {
@@ -314,7 +314,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-main": "8.1-dev"
+                    "dev-main": "8.3-dev"
                 }
             },
             "autoload": {
@@ -347,7 +347,7 @@
             "support": {
                 "issues": "https://github.com/sebastianbergmann/diff/issues",
                 "security": "https://github.com/sebastianbergmann/diff/security/policy",
-                "source": "https://github.com/sebastianbergmann/diff/tree/8.1.0"
+                "source": "https://github.com/sebastianbergmann/diff/tree/8.3.0"
             },
             "funding": [
                 {
@@ -367,7 +367,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2026-04-05T12:02:33+00:00"
+            "time": "2026-05-15T04:58:09+00:00"
         },
         {
             "name": "symfony/console",
@@ -8073,5 +8073,5 @@
         "composer-runtime-api": "^2.0"
     },
     "platform-dev": {},
-    "plugin-api-version": "2.6.0"
+    "plugin-api-version": "2.9.0"
 }