diff --git a/composer.json b/composer.json
index 42bf222..2ee09d1 100644
--- a/composer.json
+++ b/composer.json
@@ -41,7 +41,7 @@
         "phpunit/phpunit": "^8.0 || ~9.0 <9.5",
         "psy/psysh": "^0.10",
         "symfony/var-dumper": "^5.0",
-        "vimeo/psalm": "^3.6"
+        "vimeo/psalm": "^4.3"
     },
     "suggest": {
         "ext-apcu": "Required to use the APCu cache driver",
diff --git a/composer.lock b/composer.lock
index 5537450..9bddcf4 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": "38b012a49f3a19ff62628b6748997cba",
+    "content-hash": "35dc2af14f1a13efae64d07b146d247a",
     "packages": [
         {
             "name": "erusev/parsedown",
@@ -6945,16 +6945,16 @@
         },
         {
             "name": "vimeo/psalm",
-            "version": "3.18.2",
+            "version": "4.3.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vimeo/psalm.git",
-                "reference": "19aa905f7c3c7350569999a93c40ae91ae4e1626"
+                "reference": "2feba22a005a18bf31d4c7b9bdb9252c73897476"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/19aa905f7c3c7350569999a93c40ae91ae4e1626",
-                "reference": "19aa905f7c3c7350569999a93c40ae91ae4e1626",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/2feba22a005a18bf31d4c7b9bdb9252c73897476",
+                "reference": "2feba22a005a18bf31d4c7b9bdb9252c73897476",
                 "shasum": ""
             },
             "require": {
@@ -6973,12 +6973,11 @@
                 "felixfbecker/advanced-json-rpc": "^3.0.3",
                 "felixfbecker/language-server-protocol": "^1.4",
                 "netresearch/jsonmapper": "^1.0 || ^2.0 || ^3.0",
-                "nikic/php-parser": "4.3.* || 4.4.* || 4.5.* || 4.6.* || ^4.8",
+                "nikic/php-parser": "^4.10.1",
                 "openlss/lib-array2xml": "^1.0",
-                "php": "^7.1.3|^8",
+                "php": "^7.1|^8",
                 "sebastian/diff": "^3.0 || ^4.0",
                 "symfony/console": "^3.4.17 || ^4.1.6 || ^5.0",
-                "webmozart/glob": "^4.1",
                 "webmozart/path-util": "^2.3"
             },
             "provide": {
@@ -6989,11 +6988,12 @@
                 "bamarni/composer-bin-plugin": "^1.2",
                 "brianium/paratest": "^4.0.0",
                 "ext-curl": "*",
-                "phpdocumentor/reflection-docblock": "^4.3.4 || ^5",
+                "php": "^7.3|^8",
+                "phpdocumentor/reflection-docblock": "^5",
                 "phpmyadmin/sql-parser": "5.1.0",
                 "phpspec/prophecy": ">=1.9.0",
-                "phpunit/phpunit": "^7.5.16 || ^8.5 || ^9.0",
-                "psalm/plugin-phpunit": "^0.11",
+                "phpunit/phpunit": "^9.0",
+                "psalm/plugin-phpunit": "^0.13",
                 "slevomat/coding-standard": "^5.0",
                 "squizlabs/php_codesniffer": "^3.5",
                 "symfony/process": "^4.3",
@@ -7012,7 +7012,8 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.x-dev",
+                    "dev-master": "4.x-dev",
+                    "dev-3.x": "3.x-dev",
                     "dev-2.x": "2.x-dev",
                     "dev-1.x": "1.x-dev"
                 }
@@ -7043,9 +7044,9 @@
             ],
             "support": {
                 "issues": "https://github.com/vimeo/psalm/issues",
-                "source": "https://github.com/vimeo/psalm/tree/3.18.2"
+                "source": "https://github.com/vimeo/psalm/tree/4.3.1"
             },
-            "time": "2020-10-20T13:48:22+00:00"
+            "time": "2020-12-03T16:44:10+00:00"
         },
         {
             "name": "webmozart/assert",
@@ -7100,57 +7101,6 @@
             },
             "time": "2020-07-08T17:02:28+00:00"
         },
-        {
-            "name": "webmozart/glob",
-            "version": "4.1.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/webmozart/glob.git",
-                "reference": "3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/webmozart/glob/zipball/3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe",
-                "reference": "3cbf63d4973cf9d780b93d2da8eec7e4a9e63bbe",
-                "shasum": ""
-            },
-            "require": {
-                "php": "^5.3.3|^7.0",
-                "webmozart/path-util": "^2.2"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^4.6",
-                "sebastian/version": "^1.0.1",
-                "symfony/filesystem": "^2.5"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "4.1-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "Webmozart\\Glob\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Bernhard Schussek",
-                    "email": "bschussek@gmail.com"
-                }
-            ],
-            "description": "A PHP implementation of Ant's glob.",
-            "support": {
-                "issues": "https://github.com/webmozart/glob/issues",
-                "source": "https://github.com/webmozart/glob/tree/master"
-            },
-            "time": "2015-12-29T11:14:33+00:00"
-        },
         {
             "name": "webmozart/path-util",
             "version": "2.3.0",
diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 4943185..a84b9ad 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<files psalm-version="3.15@de6e7f324f44dde540ebe7ebd4eb481b97c86f30">
+<files psalm-version="4.3.1@2feba22a005a18bf31d4c7b9bdb9252c73897476">
   <file src="app/src/Controllers/DirectoryController.php">
     <PossiblyInvalidMethodCall occurrences="1">
       <code>current</code>
diff --git a/psalm.xml b/psalm.xml
index 0c41d92..1cd16b8 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -43,7 +43,6 @@
         <MissingReturnType errorLevel="info" />
         <MissingPropertyType errorLevel="info" />
         <InvalidDocblock errorLevel="info" />
-        <MisplacedRequiredParam errorLevel="info" />
 
         <PropertyNotSetInConstructor errorLevel="info" />
         <MissingConstructor errorLevel="info" />