diff --git a/composer.json b/composer.json
index c405d462..fcacf4e9 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
   "require": {
     "php": "^7.1",
     "ext-json": "*",
-    "ergebnis/json-printer": "^3.0.2",
+    "ergebnis/json-printer": "^3.1.0",
     "justinrainbow/json-schema": "^5.2.10"
   },
   "require-dev": {
diff --git a/composer.lock b/composer.lock
index d2706850..30538920 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,38 +4,41 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "f4c711635af675f2787dc907a1fcd4dc",
+    "content-hash": "70ae7e97480452ccbba5e8d67fa50a17",
     "packages": [
         {
             "name": "ergebnis/json-printer",
-            "version": "3.0.2",
+            "version": "3.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ergebnis/json-printer.git",
-                "reference": "c7985dc4879777f2e4ab689da25bdd49f59dd2cb"
+                "reference": "776a5c85ce3c67d97c6af08a67c917adbdb4758e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ergebnis/json-printer/zipball/c7985dc4879777f2e4ab689da25bdd49f59dd2cb",
-                "reference": "c7985dc4879777f2e4ab689da25bdd49f59dd2cb",
+                "url": "https://api.github.com/repos/ergebnis/json-printer/zipball/776a5c85ce3c67d97c6af08a67c917adbdb4758e",
+                "reference": "776a5c85ce3c67d97c6af08a67c917adbdb4758e",
                 "shasum": ""
             },
             "require": {
                 "ext-json": "*",
                 "ext-mbstring": "*",
-                "php": "^7.1"
+                "php": "^7.1 || ^8.0"
             },
             "require-dev": {
-                "ergebnis/php-cs-fixer-config": "~1.1.1",
-                "ergebnis/phpstan-rules": "~0.14.1",
-                "ergebnis/test-util": "~0.9.0",
+                "ergebnis/license": "~1.0.0",
+                "ergebnis/php-cs-fixer-config": "^2.2.1",
+                "ergebnis/phpstan-rules": "~0.15.0",
+                "ergebnis/test-util": "~1.0.0",
                 "infection/infection": "~0.13.6",
-                "phpbench/phpbench": "~0.16.10",
-                "phpstan/extension-installer": "^1.0.3",
-                "phpstan/phpstan": "~0.11.19",
-                "phpstan/phpstan-deprecation-rules": "~0.11.2",
-                "phpstan/phpstan-strict-rules": "~0.11.1",
-                "phpunit/phpunit": "^7.5.18"
+                "phpstan/extension-installer": "^1.0.4",
+                "phpstan/phpstan": "~0.12.32",
+                "phpstan/phpstan-deprecation-rules": "~0.12.4",
+                "phpstan/phpstan-phpunit": "~0.12.11",
+                "phpstan/phpstan-strict-rules": "~0.12.2",
+                "phpunit/phpunit": "^7.5.20",
+                "psalm/plugin-phpunit": "~0.10.1",
+                "vimeo/psalm": "^3.12.2"
             },
             "type": "library",
             "autoload": {
@@ -60,7 +63,29 @@
                 "json",
                 "printer"
             ],
-            "time": "2019-12-19T14:42:54+00:00"
+            "funding": [
+                {
+                    "url": "https://cottonbureau.com/people/andreas-moller",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://paypal.me/localheinz",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.amazon.de/hz/wishlist/ls/2NCHMSJ4BC1OW",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.buymeacoffee.com/localheinz",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/localheinz",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-07-04T17:09:39+00:00"
         },
         {
             "name": "justinrainbow/json-schema",