diff --git a/composer.json b/composer.json
index 8a79e833..98e7ebb5 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,7 @@
     "phpstan/phpstan-strict-rules": "~0.12.2",
     "phpunit/phpunit": "^7.5.20",
     "psalm/plugin-phpunit": "~0.10.0",
-    "vimeo/psalm": "^3.10.1"
+    "vimeo/psalm": "^3.11.2"
   },
   "config": {
     "platform": {
diff --git a/composer.lock b/composer.lock
index 2e3998c8..d45b1c96 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": "97050be8ffb5c90399d72b186d9574e6",
+    "content-hash": "ccb89033e9890967dace6c9f21427e46",
     "packages": [
         {
             "name": "ergebnis/json-printer",
@@ -132,16 +132,16 @@
     "packages-dev": [
         {
             "name": "amphp/amp",
-            "version": "v2.4.1",
+            "version": "v2.4.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/amp.git",
-                "reference": "2ac3b550c4997f2ec304faa63c8b2885079a2dc4"
+                "reference": "feca077369a47263b22156b3c6389e55f3809f24"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/amp/zipball/2ac3b550c4997f2ec304faa63c8b2885079a2dc4",
-                "reference": "2ac3b550c4997f2ec304faa63c8b2885079a2dc4",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/feca077369a47263b22156b3c6389e55f3809f24",
+                "reference": "feca077369a47263b22156b3c6389e55f3809f24",
                 "shasum": ""
             },
             "require": {
@@ -151,14 +151,15 @@
                 "amphp/php-cs-fixer-config": "dev-master",
                 "amphp/phpunit-util": "^1",
                 "ext-json": "*",
-                "phpstan/phpstan": "^0.8.5",
+                "jetbrains/phpstorm-stubs": "^2019.3",
                 "phpunit/phpunit": "^6.0.9 | ^7",
-                "react/promise": "^2"
+                "react/promise": "^2",
+                "vimeo/psalm": "^3.9@dev"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.0.x-dev"
+                    "dev-master": "2.x-dev"
                 }
             },
             "autoload": {
@@ -205,20 +206,20 @@
                 "non-blocking",
                 "promise"
             ],
-            "time": "2020-02-10T18:10:57+00:00"
+            "time": "2020-04-04T15:05:26+00:00"
         },
         {
             "name": "amphp/byte-stream",
-            "version": "v1.7.2",
+            "version": "v1.7.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/byte-stream.git",
-                "reference": "1e52f1752b2e20e2a7e464476ef887a2388e3832"
+                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/1e52f1752b2e20e2a7e464476ef887a2388e3832",
-                "reference": "1e52f1752b2e20e2a7e464476ef887a2388e3832",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/b867505edb79dda8f253ca3c3a2bbadae4b16592",
+                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592",
                 "shasum": ""
             },
             "require": {
@@ -228,10 +229,16 @@
                 "amphp/php-cs-fixer-config": "dev-master",
                 "amphp/phpunit-util": "^1",
                 "friendsofphp/php-cs-fixer": "^2.3",
-                "infection/infection": "^0.9.3",
-                "phpunit/phpunit": "^6"
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6 || ^7 || ^8",
+                "vimeo/psalm": "^3.9@dev"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
             "autoload": {
                 "psr-4": {
                     "Amp\\ByteStream\\": "lib"
@@ -264,7 +271,7 @@
                 "non-blocking",
                 "stream"
             ],
-            "time": "2020-01-29T18:22:23+00:00"
+            "time": "2020-04-04T16:56:54+00:00"
         },
         {
             "name": "composer/ca-bundle",
@@ -1337,16 +1344,16 @@
         },
         {
             "name": "netresearch/jsonmapper",
-            "version": "v1.6.0",
+            "version": "v2.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/cweiske/jsonmapper.git",
-                "reference": "0d4d1b48d682a93b6bfedf60b88c7750e9cb0b06"
+                "reference": "e0f1e33a71587aca81be5cffbb9746510e1fe04e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/0d4d1b48d682a93b6bfedf60b88c7750e9cb0b06",
-                "reference": "0d4d1b48d682a93b6bfedf60b88c7750e9cb0b06",
+                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/e0f1e33a71587aca81be5cffbb9746510e1fe04e",
+                "reference": "e0f1e33a71587aca81be5cffbb9746510e1fe04e",
                 "shasum": ""
             },
             "require": {
@@ -1357,8 +1364,8 @@
                 "php": ">=5.6"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.8.35 || ~5.7 || ~6.4",
-                "squizlabs/php_codesniffer": "~1.5"
+                "phpunit/phpunit": "~4.8.35 || ~5.7 || ~6.4 || ~7.0",
+                "squizlabs/php_codesniffer": "~3.5"
             },
             "type": "library",
             "autoload": {
@@ -1379,20 +1386,20 @@
                 }
             ],
             "description": "Map nested JSON structures onto PHP classes",
-            "time": "2019-08-15T19:41:25+00:00"
+            "time": "2020-04-16T18:48:43+00:00"
         },
         {
             "name": "nikic/php-parser",
-            "version": "v4.3.0",
+            "version": "v4.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/nikic/PHP-Parser.git",
-                "reference": "9a9981c347c5c49d6dfe5cf826bb882b824080dc"
+                "reference": "bd43ec7152eaaab3bd8c6d0aa95ceeb1df8ee120"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/9a9981c347c5c49d6dfe5cf826bb882b824080dc",
-                "reference": "9a9981c347c5c49d6dfe5cf826bb882b824080dc",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/bd43ec7152eaaab3bd8c6d0aa95ceeb1df8ee120",
+                "reference": "bd43ec7152eaaab3bd8c6d0aa95ceeb1df8ee120",
                 "shasum": ""
             },
             "require": {
@@ -1431,7 +1438,7 @@
                 "parser",
                 "php"
             ],
-            "time": "2019-11-08T13:50:10+00:00"
+            "time": "2020-04-10T16:34:50+00:00"
         },
         {
             "name": "ocramius/package-versions",
@@ -4310,16 +4317,16 @@
         },
         {
             "name": "vimeo/psalm",
-            "version": "3.10.1",
+            "version": "3.11.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vimeo/psalm.git",
-                "reference": "eeed5ecccc10131397f0eb7ee6da810c0be3a7fc"
+                "reference": "d470903722cfcbc1cd04744c5491d3e6d13ec3d9"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vimeo/psalm/zipball/eeed5ecccc10131397f0eb7ee6da810c0be3a7fc",
-                "reference": "eeed5ecccc10131397f0eb7ee6da810c0be3a7fc",
+                "url": "https://api.github.com/repos/vimeo/psalm/zipball/d470903722cfcbc1cd04744c5491d3e6d13ec3d9",
+                "reference": "d470903722cfcbc1cd04744c5491d3e6d13ec3d9",
                 "shasum": ""
             },
             "require": {
@@ -4334,7 +4341,7 @@
                 "ext-tokenizer": "*",
                 "felixfbecker/advanced-json-rpc": "^3.0.3",
                 "felixfbecker/language-server-protocol": "^1.4",
-                "netresearch/jsonmapper": "^1.0",
+                "netresearch/jsonmapper": "^1.0 || ^2.0",
                 "nikic/php-parser": "^4.3",
                 "ocramius/package-versions": "^1.2",
                 "openlss/lib-array2xml": "^1.0",
@@ -4348,13 +4355,15 @@
                 "psalm/psalm": "self.version"
             },
             "require-dev": {
+                "amphp/amp": "^2.4.2",
                 "bamarni/composer-bin-plugin": "^1.2",
                 "brianium/paratest": "^4.0.0",
                 "ext-curl": "*",
+                "php-coveralls/php-coveralls": "^2.2",
                 "phpmyadmin/sql-parser": "5.1.0",
                 "phpspec/prophecy": ">=1.9.0",
-                "phpunit/phpunit": "^7.5.16 || ^8.5",
-                "psalm/plugin-phpunit": "^0.9",
+                "phpunit/phpunit": "^7.5.16 || ^8.5 || ^9.0",
+                "psalm/plugin-phpunit": "^0.10",
                 "slevomat/coding-standard": "^5.0",
                 "squizlabs/php_codesniffer": "^3.5",
                 "symfony/process": "^4.3"
@@ -4402,7 +4411,7 @@
                 "inspection",
                 "php"
             ],
-            "time": "2020-03-23T11:40:30+00:00"
+            "time": "2020-04-13T12:47:11+00:00"
         },
         {
             "name": "webmozart/assert",
diff --git a/src/Vendor/Composer/PackageHashNormalizer.php b/src/Vendor/Composer/PackageHashNormalizer.php
index 0ca46e2f..727cc2ca 100644
--- a/src/Vendor/Composer/PackageHashNormalizer.php
+++ b/src/Vendor/Composer/PackageHashNormalizer.php
@@ -53,6 +53,7 @@ public function normalize(Json $json): Json
         }
 
         foreach ($objectProperties as $name => $value) {
+            /** @var array<string, string> $packages */
             $packages = (array) $decoded->{$name};
 
             if (0 === \count($packages)) {
@@ -74,9 +75,9 @@ public function normalize(Json $json): Json
      *
      * @see https://github.com/composer/composer/blob/1.6.2/src/Composer/Json/JsonManipulator.php#L110-L146
      *
-     * @param string[] $packages
+     * @param array<string, string> $packages
      *
-     * @return string[]
+     * @return array<string, string>
      */
     private static function sortPackages(array $packages): array
     {