diff --git a/composer.json b/composer.json
index 2273b51..31dcca8 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "laminas/laminas-diactoros": "^2.19",
         "lcobucci/coding-standard": "^8.0",
         "phpstan/extension-installer": "^1.2",
-        "phpstan/phpstan": "^1.8",
+        "phpstan/phpstan": "^1.9",
         "phpstan/phpstan-deprecation-rules": "^1.0",
         "phpstan/phpstan-phpunit": "^1.1",
         "phpstan/phpstan-strict-rules": "^1.4",
diff --git a/composer.lock b/composer.lock
index 6307e74..c1bf598 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": "1ac2a61d659e1c587e9b0e6bac56d2c8",
+    "content-hash": "d4db0513b6a27a04d3f5e2727a124755",
     "packages": [
         {
             "name": "fig/http-message-util",
@@ -1663,16 +1663,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.8.10",
+            "version": "1.9.18",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "0c4459dc42c568b818b3f25186589f3acddc1823"
+                "reference": "f2d5cf71be91172a57c649770b73c20ebcffb0bf"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/0c4459dc42c568b818b3f25186589f3acddc1823",
-                "reference": "0c4459dc42c568b818b3f25186589f3acddc1823",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/f2d5cf71be91172a57c649770b73c20ebcffb0bf",
+                "reference": "f2d5cf71be91172a57c649770b73c20ebcffb0bf",
                 "shasum": ""
             },
             "require": {
@@ -1702,7 +1702,7 @@
             ],
             "support": {
                 "issues": "https://github.com/phpstan/phpstan/issues",
-                "source": "https://github.com/phpstan/phpstan/tree/1.8.10"
+                "source": "https://github.com/phpstan/phpstan/tree/1.9.18"
             },
             "funding": [
                 {
@@ -1718,7 +1718,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-10-17T14:23:35+00:00"
+            "time": "2023-02-17T15:01:27+00:00"
         },
         {
             "name": "phpstan/phpstan-deprecation-rules",