diff --git a/composer.json b/composer.json
index 9251a64b6..fbf9f1fd6 100644
--- a/composer.json
+++ b/composer.json
@@ -53,7 +53,7 @@
       "webmozart/path-util": "^2.3"
    },
    "require-dev": {
-      "phpstan/phpstan": "1.8.11",
+      "phpstan/phpstan": "1.9.1",
       "phpstan/phpstan-phpunit": "^1.1.0",
       "phpstan/phpstan-strict-rules": "^1.2.0",
       "phpunit/phpunit": "^9.2"
diff --git a/composer.lock b/composer.lock
index 4814b9193..b3cd775be 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": "0a402cad3151b4efa4f5da8034293b6d",
+    "content-hash": "e2b0a5b76ace05c6d6bd760d1f96ebe5",
     "packages": [
         {
             "name": "adhocore/json-comment",
@@ -1510,16 +1510,16 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.8.11",
+            "version": "1.9.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "46e223dd68a620da18855c23046ddb00940b4014"
+                "reference": "a59c8b5bfd4a236f27efc8b5ce72c313c2b54b5f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/46e223dd68a620da18855c23046ddb00940b4014",
-                "reference": "46e223dd68a620da18855c23046ddb00940b4014",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/a59c8b5bfd4a236f27efc8b5ce72c313c2b54b5f",
+                "reference": "a59c8b5bfd4a236f27efc8b5ce72c313c2b54b5f",
                 "shasum": ""
             },
             "require": {
@@ -1549,7 +1549,7 @@
             ],
             "support": {
                 "issues": "https://github.com/phpstan/phpstan/issues",
-                "source": "https://github.com/phpstan/phpstan/tree/1.8.11"
+                "source": "https://github.com/phpstan/phpstan/tree/1.9.1"
             },
             "funding": [
                 {
@@ -1565,7 +1565,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2022-10-24T15:45:13+00:00"
+            "time": "2022-11-04T13:35:59+00:00"
         },
         {
             "name": "phpstan/phpstan-phpunit",
diff --git a/src/command/defaults/HelpCommand.php b/src/command/defaults/HelpCommand.php
index 3dc581838..3173a1ee2 100644
--- a/src/command/defaults/HelpCommand.php
+++ b/src/command/defaults/HelpCommand.php
@@ -76,7 +76,6 @@ class HelpCommand extends VanillaCommand{
 		$pageHeight = $sender->getScreenLineHeight();
 
 		if($commandName === ""){
-			/** @var Command[][] $commands */
 			$commands = [];
 			foreach($sender->getServer()->getCommandMap()->getCommands() as $command){
 				if($command->testPermissionSilent($sender)){
diff --git a/src/plugin/PluginGraylist.php b/src/plugin/PluginGraylist.php
index ef719b72b..84aa3f792 100644
--- a/src/plugin/PluginGraylist.php
+++ b/src/plugin/PluginGraylist.php
@@ -70,8 +70,7 @@ class PluginGraylist{
 		}
 		$isWhitelist = match($array["mode"]){
 			"whitelist" => true,
-			"blacklist" => false,
-			default => throw new \InvalidArgumentException("\"mode\" must be either \"whitelist\" or \"blacklist\"")
+			"blacklist" => false
 		};
 		$plugins = [];
 		if(isset($array["plugins"])){
diff --git a/src/utils/Utils.php b/src/utils/Utils.php
index 35d6595ca..3e8e420b7 100644
--- a/src/utils/Utils.php
+++ b/src/utils/Utils.php
@@ -313,7 +313,7 @@ final class Utils{
 					}
 				}elseif(($cpuPresent = @file_get_contents("/sys/devices/system/cpu/present")) !== false){
 					if(preg_match("/^([0-9]+)\\-([0-9]+)$/", trim($cpuPresent), $matches) > 0){
-						$processors = (int) ($matches[2] - $matches[1]);
+						$processors = ((int) $matches[2]) - ((int) $matches[1]);
 					}
 				}
 				break;
diff --git a/tests/phpstan/configs/phpstan-bugs.neon b/tests/phpstan/configs/phpstan-bugs.neon
index e50532cfd..c84371b11 100644
--- a/tests/phpstan/configs/phpstan-bugs.neon
+++ b/tests/phpstan/configs/phpstan-bugs.neon
@@ -15,6 +15,11 @@ parameters:
 			count: 1
 			path: ../../../src/entity/projectile/Projectile.php
 
+		-
+			message: "#^Empty array passed to foreach\\.$#"
+			count: 1
+			path: ../../../src/network/mcpe/cache/ChunkCache.php
+
 		-
 			message: "#^Match arm comparison between 4 and 4 is always true\\.$#"
 			count: 1