diff --git a/composer.json b/composer.json
index c8bbbc3..fd685f2 100755
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,7 @@
         "christian-riesen/base32": "^1.3",
         "paragonie/sodium_compat": "^1.0",
         "phpseclib/phpseclib": "^2.0.6",
-        "symfony/filesystem": "^3.3"
+        "symfony/filesystem": "^4.1"
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     "authors": [
diff --git a/composer.lock b/composer.lock
old mode 100755
new mode 100644
index f4cceb8..2169a4f
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
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-    "content-hash": "49c183455fe9fdd712fa75896e2756b4",
+    "content-hash": "028fa7646668c51f7c7f0672d4fd3ab2",
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@@ -62,16 +62,16 @@
         },
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-            "version": "6.2.3",
+            "version": "6.3.3",
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                 "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "8d6c6cc55186db87b7dc5009827429ba4e9dc006"
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@@ -81,13 +81,16 @@
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                 "ext-curl": "*",
-                "phpunit/phpunit": "^4.0",
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.4 || ^7.0",
                 "psr/log": "^1.0"
             },
+            "suggest": {
+                "psr/log": "Required for using the Log middleware"
+            },
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+                    "dev-master": "6.3-dev"
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@@ -120,7 +123,7 @@
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                 "web service"
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-            "time": "2017-02-28T22:50:30+00:00"
+            "time": "2018-04-22T15:46:56+00:00"
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@@ -240,33 +243,29 @@
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-            "version": "v2.0.10",
+            "version": "v9.99.99",
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                 "url": "https://github.com/paragonie/random_compat.git",
-                "reference": "634bae8e911eefa89c1abfbf1b66da679ac8f54d"
+                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95"
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-                "reference": "634bae8e911eefa89c1abfbf1b66da679ac8f54d",
+                "url": "https://api.github.com/repos/paragonie/random_compat/zipball/84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
+                "reference": "84b4dfb120c6f9b4ff7b3685f9b8f1aa365a0c95",
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             "require": {
-                "php": ">=5.2.0"
+                "php": "^7"
             },
             "require-dev": {
-                "phpunit/phpunit": "4.*|5.*"
+                "phpunit/phpunit": "4.*|5.*",
+                "vimeo/psalm": "^1"
             },
             "suggest": {
                 "ext-libsodium": "Provides a modern crypto API that can be used to generate random bytes."
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-            "autoload": {
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                 "MIT"
@@ -281,34 +280,36 @@
             "description": "PHP 5.x polyfill for random_bytes() and random_int() from PHP 7",
             "keywords": [
                 "csprng",
+                "polyfill",
                 "pseudorandom",
                 "random"
             ],
-            "time": "2017-03-13T16:27:32+00:00"
+            "time": "2018-07-02T15:55:56+00:00"
         },
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-            "version": "v1.0.1",
+            "version": "v1.6.3",
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                 "url": "https://github.com/paragonie/sodium_compat.git",
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-                "paragonie/random_compat": "^1|^2",
+                "paragonie/random_compat": ">=1",
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                 "phpunit/phpunit": "^3|^4|^5"
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             "suggest": {
-                "ext-libsodium": "Better performance, password hashing (Argon2i), secure memory management (memzero), and better security."
+                "ext-libsodium": "PHP < 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security.",
+                "ext-sodium": "PHP >= 7.0: Better performance, password hashing (Argon2i), secure memory management (memzero), and better security."
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@@ -365,20 +366,20 @@
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-            "time": "2017-06-09T22:35:18+00:00"
+            "time": "2018-06-06T17:30:29+00:00"
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         {
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-            "version": "2.0.6",
+            "version": "2.0.11",
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                 "url": "https://github.com/phpseclib/phpseclib.git",
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@@ -386,7 +387,7 @@
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-                "phpunit/phpunit": "~4.0",
+                "phpunit/phpunit": "^4.8.35|^5.7|^6.0",
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@@ -457,7 +458,7 @@
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-            "time": "2017-06-05T06:31:10+00:00"
+            "time": "2018-04-15T16:55:05+00:00"
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@@ -511,25 +512,26 @@
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-            "version": "v3.3.13",
+            "version": "v4.1.2",
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                 "url": "https://github.com/symfony/filesystem.git",
-                "reference": "77db266766b54db3ee982fe51868328b887ce15c"
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-                "reference": "77db266766b54db3ee982fe51868328b887ce15c",
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-                "php": "^5.5.9|>=7.0.8"
+                "php": "^7.1.3",
+                "symfony/polyfill-ctype": "~1.8"
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+                    "dev-master": "4.1-dev"
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@@ -556,7 +558,62 @@
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             "homepage": "https://symfony.com",
-            "time": "2017-11-07T14:12:55+00:00"
+            "time": "2018-05-30T07:26:09+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.8.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/symfony/polyfill-ctype.git",
+                "reference": "7cc359f1b7b80fc25ed7796be7d96adc9b354bae"
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+                "shasum": ""
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+                "php": ">=5.3.3"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.8-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Symfony\\Polyfill\\Ctype\\": ""
+                },
+                "files": [
+                    "bootstrap.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Symfony Community",
+                    "homepage": "https://symfony.com/contributors"
+                },
+                {
+                    "name": "Gert de Pagter",
+                    "email": "BackEndTea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
+                "portable"
+            ],
+            "time": "2018-04-30T19:57:29+00:00"
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@@ -616,25 +673,28 @@
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-            "version": "1.7.0",
+            "version": "1.8.1",
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                 "url": "https://github.com/myclabs/DeepCopy.git",
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             "require": {
-                "php": "^5.6 || ^7.0"
+                "php": "^7.1"
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+            "replace": {
+                "myclabs/deep-copy": "self.version"
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                 "doctrine/common": "^2.6",
-                "phpunit/phpunit": "^4.1"
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@@ -657,7 +717,7 @@
                 "object",
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-            "time": "2017-10-19T19:58:43+00:00"
+            "time": "2018-06-11T23:09:50+00:00"
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@@ -817,29 +877,35 @@
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                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
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                 "webmozart/assert": "^1.0"
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             "require-dev": {
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-                "phpunit/phpunit": "^4.4"
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+                "phpunit/phpunit": "^6.4"
             },
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+            "extra": {
+                "branch-alias": {
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@@ -858,7 +924,7 @@
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-            "time": "2017-08-30T18:51:59+00:00"
+            "time": "2017-11-30T07:14:17+00:00"
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@@ -909,28 +975,28 @@
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@@ -968,20 +1034,20 @@
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-            "time": "2017-09-04T11:05:03+00:00"
+            "time": "2018-04-18T13:57:24+00:00"
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@@ -990,14 +1056,13 @@
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@@ -1006,7 +1071,7 @@
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@@ -1021,7 +1086,7 @@
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-                    "email": "sb@sebastian-bergmann.de",
+                    "email": "sebastian@phpunit.de",
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@@ -1032,20 +1097,20 @@
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@@ -1079,7 +1144,7 @@
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@@ -1173,16 +1238,16 @@
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