diff --git a/bootstrap.php b/bootstrap.php
index 7cd26be..d938aa4 100644
--- a/bootstrap.php
+++ b/bootstrap.php
@@ -9,5 +9,5 @@ chdir($root);
 
 //Check if root env file hash been loaded (in case plugin installed in existing project)
 if (!getenv('SERVER_ADDRESS')) {
-    Dotenv\Dotenv::create($root, '.env')->load();
+    Dotenv\Dotenv::createImmutable($root)->load();
 }
diff --git a/composer.json b/composer.json
index fef843f..4542f5b 100644
--- a/composer.json
+++ b/composer.json
@@ -9,10 +9,11 @@
     "php": ">=7.3.0",
     "ext-json": "*",
     "amphp/http-server": "^2",
-    "vlucas/phpdotenv": "^3",
+    "vlucas/phpdotenv": "^4",
     "danog/madelineproto":"^5"
   },
   "minimum-stability": "dev",
+  "prefer-stable": true,
   "authors": [
     {
       "name": "Alexander Pankratov",
diff --git a/composer.lock b/composer.lock
index fe12e56..f771c3c 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": "e6402b29093e8463dff6bf8559aafc84",
+    "content-hash": "75ba1bc8d195a8a0bee6e46757f5aa25",
     "packages": [
         {
             "name": "amphp/amp",
@@ -902,33 +902,34 @@
         },
         {
             "name": "amphp/sync",
-            "version": "v1.x-dev",
+            "version": "v1.3.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/sync.git",
-                "reference": "eafe96a8f25fc01e08666dbddeb2e60d60488f7f"
+                "reference": "512d62e83c8b8d5c848183005c70e70df2bcca55"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/sync/zipball/eafe96a8f25fc01e08666dbddeb2e60d60488f7f",
-                "reference": "eafe96a8f25fc01e08666dbddeb2e60d60488f7f",
+                "url": "https://api.github.com/repos/amphp/sync/zipball/512d62e83c8b8d5c848183005c70e70df2bcca55",
+                "reference": "512d62e83c8b8d5c848183005c70e70df2bcca55",
                 "shasum": ""
             },
             "require": {
-                "amphp/amp": "^2"
+                "amphp/amp": "^2.2",
+                "php": ">=7.1"
             },
             "require-dev": {
-                "amphp/phpunit-util": "^1",
-                "friendsofphp/php-cs-fixer": "^2.3",
-                "phpunit/phpunit": "^6"
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1.1",
+                "phpunit/phpunit": "^8 || ^7"
             },
             "type": "library",
             "autoload": {
                 "psr-4": {
-                    "Amp\\Sync\\": "lib"
+                    "Amp\\Sync\\": "src"
                 },
                 "files": [
-                    "lib/functions.php"
+                    "src/functions.php"
                 ]
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -954,7 +955,7 @@
                 "semaphore",
                 "synchronization"
             ],
-            "time": "2019-09-20T03:24:36+00:00"
+            "time": "2019-11-08T18:42:56+00:00"
         },
         {
             "name": "amphp/uri",
@@ -1627,7 +1628,7 @@
         },
         {
             "name": "daverandom/libdns",
-            "version": "2.x-dev",
+            "version": "v2.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/DaveRandom/LibDNS.git",
@@ -1667,16 +1668,16 @@
         },
         {
             "name": "erusev/parsedown",
-            "version": "1.8.0-beta-7",
+            "version": "1.7.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/erusev/parsedown.git",
-                "reference": "fe7a50eceb4a3c867cc9fa9c0aa906b1067d1955"
+                "reference": "cb17b6477dfff935958ba01325f2e8a2bfa6dab3"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/erusev/parsedown/zipball/fe7a50eceb4a3c867cc9fa9c0aa906b1067d1955",
-                "reference": "fe7a50eceb4a3c867cc9fa9c0aa906b1067d1955",
+                "url": "https://api.github.com/repos/erusev/parsedown/zipball/cb17b6477dfff935958ba01325f2e8a2bfa6dab3",
+                "reference": "cb17b6477dfff935958ba01325f2e8a2bfa6dab3",
                 "shasum": ""
             },
             "require": {
@@ -1709,7 +1710,7 @@
                 "markdown",
                 "parser"
             ],
-            "time": "2019-03-17T18:47:21+00:00"
+            "time": "2019-12-30T22:54:17+00:00"
         },
         {
             "name": "kelunik/certificate",
@@ -1843,7 +1844,7 @@
         },
         {
             "name": "league/uri-interfaces",
-            "version": "dev-master",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/uri-interfaces.git",
@@ -1900,16 +1901,16 @@
         },
         {
             "name": "league/uri-parser",
-            "version": "1.x-dev",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/thephpleague/uri-parser.git",
-                "reference": "917b60f69f7e2960b5026d3920e8066545139dcb"
+                "reference": "671548427e4c932352d9b9279fdfa345bf63fa00"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/thephpleague/uri-parser/zipball/917b60f69f7e2960b5026d3920e8066545139dcb",
-                "reference": "917b60f69f7e2960b5026d3920e8066545139dcb",
+                "url": "https://api.github.com/repos/thephpleague/uri-parser/zipball/671548427e4c932352d9b9279fdfa345bf63fa00",
+                "reference": "671548427e4c932352d9b9279fdfa345bf63fa00",
                 "shasum": ""
             },
             "require": {
@@ -1961,11 +1962,11 @@
                 "uri",
                 "url"
             ],
-            "time": "2019-09-20T22:27:10+00:00"
+            "time": "2018-11-22T07:55:51+00:00"
         },
         {
             "name": "paragonie/constant_time_encoding",
-            "version": "v1.x-dev",
+            "version": "v1.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/paragonie/constant_time_encoding.git",
@@ -2077,7 +2078,7 @@
         },
         {
             "name": "phpoption/phpoption",
-            "version": "dev-master",
+            "version": "1.7.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/schmittjoh/php-option.git",
@@ -2132,16 +2133,16 @@
         },
         {
             "name": "psr/http-message",
-            "version": "dev-master",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/http-message.git",
-                "reference": "efd67d1dc14a7ef4fc4e518e7dee91c271d524e4"
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/http-message/zipball/efd67d1dc14a7ef4fc4e518e7dee91c271d524e4",
-                "reference": "efd67d1dc14a7ef4fc4e518e7dee91c271d524e4",
+                "url": "https://api.github.com/repos/php-fig/http-message/zipball/f6561bf28d520154e4b0ec72be95418abe6d9363",
+                "reference": "f6561bf28d520154e4b0ec72be95418abe6d9363",
                 "shasum": ""
             },
             "require": {
@@ -2178,20 +2179,20 @@
                 "request",
                 "response"
             ],
-            "time": "2019-08-29T13:16:46+00:00"
+            "time": "2016-08-06T14:39:51+00:00"
         },
         {
             "name": "psr/log",
-            "version": "dev-master",
+            "version": "1.1.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/log.git",
-                "reference": "5628725d0e4d687e29575eb41f9d5ee7de33a84c"
+                "reference": "446d54b4cb6bf489fc9d75f55843658e6f25d801"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/5628725d0e4d687e29575eb41f9d5ee7de33a84c",
-                "reference": "5628725d0e4d687e29575eb41f9d5ee7de33a84c",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/446d54b4cb6bf489fc9d75f55843658e6f25d801",
+                "reference": "446d54b4cb6bf489fc9d75f55843658e6f25d801",
                 "shasum": ""
             },
             "require": {
@@ -2225,11 +2226,11 @@
                 "psr",
                 "psr-3"
             ],
-            "time": "2019-11-12T16:45:05+00:00"
+            "time": "2019-11-01T11:05:21+00:00"
         },
         {
             "name": "symfony/polyfill-ctype",
-            "version": "dev-master",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-ctype.git",
@@ -2287,30 +2288,31 @@
         },
         {
             "name": "vlucas/phpdotenv",
-            "version": "3.6.x-dev",
+            "version": "v4.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/vlucas/phpdotenv.git",
-                "reference": "1bdf24f065975594f6a117f0f1f6cabf1333b156"
+                "reference": "0176075a1b7ee9cf86f70143ec79edf7072c975a"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/vlucas/phpdotenv/zipball/1bdf24f065975594f6a117f0f1f6cabf1333b156",
-                "reference": "1bdf24f065975594f6a117f0f1f6cabf1333b156",
+                "url": "https://api.github.com/repos/vlucas/phpdotenv/zipball/0176075a1b7ee9cf86f70143ec79edf7072c975a",
+                "reference": "0176075a1b7ee9cf86f70143ec79edf7072c975a",
                 "shasum": ""
             },
             "require": {
-                "php": "^5.4 || ^7.0",
-                "phpoption/phpoption": "^1.5",
+                "php": "^5.5.9 || ^7.0",
+                "phpoption/phpoption": "^1.7.1",
                 "symfony/polyfill-ctype": "^1.9"
             },
             "require-dev": {
+                "bamarni/composer-bin-plugin": "^1.3",
                 "phpunit/phpunit": "^4.8.35 || ^5.0 || ^6.0 || ^7.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "3.6-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
@@ -2340,14 +2342,14 @@
                 "env",
                 "environment"
             ],
-            "time": "2019-09-10T21:37:39+00:00"
+            "time": "2019-12-14T13:59:29+00:00"
         }
     ],
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "dev",
     "stability-flags": [],
-    "prefer-stable": false,
+    "prefer-stable": true,
     "prefer-lowest": false,
     "platform": {
         "php": ">=7.3.0",