diff --git a/composer.json b/composer.json
index 5fbadce..5ec5048 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "squizlabs/php_codesniffer": "~3.0.0",
     "phpunit/phpunit": "~5.7.2",
     "ffmpeg/ffmpeg": "dev-release",
-    "rg3/youtube-dl": "~2017.05.09",
+    "rg3/youtube-dl": "~2017.09.11",
     "rudloff/rtmpdump-bin": "~2.3.0",
     "heroku/heroku-buildpack-php": "*"
   },
@@ -39,10 +39,10 @@
       "type": "package",
       "package": {
         "name": "rg3/youtube-dl",
-        "version": "2017.05.09",
+        "version": "2017.09.11",
         "dist": {
           "type": "zip",
-          "url": "https://github.com/rg3/youtube-dl/archive/2017.05.09.zip"
+          "url": "https://github.com/rg3/youtube-dl/archive/2017.09.11.zip"
         }
       }
     },
diff --git a/composer.lock b/composer.lock
index 622b448..6c6df64 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "43832e17cc768672af7305037a58b8b2",
-    "content-hash": "22e16312bcf339c90850660d9e5923e7",
+    "hash": "785c3eddbd168d1ae700136520aff319",
+    "content-hash": "80a7d12432e1c7e202dfb8d997bbea0f",
     "packages": [
         {
             "name": "aura/session",
@@ -1065,16 +1065,16 @@
         },
         {
             "name": "heroku/heroku-buildpack-php",
-            "version": "v122",
+            "version": "v124",
             "source": {
                 "type": "git",
                 "url": "https://github.com/heroku/heroku-buildpack-php.git",
-                "reference": "82b6fbf8d6a9693ec2f01ccf993202bfc1bc528a"
+                "reference": "ae364349c513e569d7d4614ab3b1767eb883b858"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/82b6fbf8d6a9693ec2f01ccf993202bfc1bc528a",
-                "reference": "82b6fbf8d6a9693ec2f01ccf993202bfc1bc528a",
+                "url": "https://api.github.com/repos/heroku/heroku-buildpack-php/zipball/ae364349c513e569d7d4614ab3b1767eb883b858",
+                "reference": "ae364349c513e569d7d4614ab3b1767eb883b858",
                 "shasum": ""
             },
             "bin": [
@@ -1105,7 +1105,7 @@
                 "nginx",
                 "php"
             ],
-            "time": "2017-08-03 22:13:11"
+            "time": "2017-09-07 23:07:36"
         },
         {
             "name": "myclabs/deep-copy",
@@ -1151,16 +1151,16 @@
         },
         {
             "name": "phpdocumentor/reflection-common",
-            "version": "1.0",
+            "version": "1.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionCommon.git",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c"
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
-                "reference": "144c307535e82c8fdcaacbcfc1d6d8eeb896687c",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionCommon/zipball/21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
+                "reference": "21bdeb5f65d7ebf9f43b1b25d404f87deab5bfb6",
                 "shasum": ""
             },
             "require": {
@@ -1201,26 +1201,26 @@
                 "reflection",
                 "static analysis"
             ],
-            "time": "2015-12-27 11:43:31"
+            "time": "2017-09-11 18:02:19"
         },
         {
             "name": "phpdocumentor/reflection-docblock",
-            "version": "3.2.1",
+            "version": "4.1.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/ReflectionDocBlock.git",
-                "reference": "183824db76118b9dddffc7e522b91fa175f75119"
+                "reference": "2d3d238c433cf69caeb4842e97a3223a116f94b2"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/183824db76118b9dddffc7e522b91fa175f75119",
-                "reference": "183824db76118b9dddffc7e522b91fa175f75119",
+                "url": "https://api.github.com/repos/phpDocumentor/ReflectionDocBlock/zipball/2d3d238c433cf69caeb4842e97a3223a116f94b2",
+                "reference": "2d3d238c433cf69caeb4842e97a3223a116f94b2",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.5",
+                "php": "^7.0",
                 "phpdocumentor/reflection-common": "^1.0@dev",
-                "phpdocumentor/type-resolver": "^0.3.0",
+                "phpdocumentor/type-resolver": "^0.4.0",
                 "webmozart/assert": "^1.0"
             },
             "require-dev": {
@@ -1246,20 +1246,20 @@
                 }
             ],
             "description": "With this component, a library can provide support for annotations via DocBlocks or otherwise retrieve information that is embedded in a DocBlock.",
-            "time": "2017-08-04 20:55:59"
+            "time": "2017-08-30 18:51:59"
         },
         {
             "name": "phpdocumentor/type-resolver",
-            "version": "0.3.0",
+            "version": "0.4.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpDocumentor/TypeResolver.git",
-                "reference": "fb3933512008d8162b3cdf9e18dba9309b7c3773"
+                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/fb3933512008d8162b3cdf9e18dba9309b7c3773",
-                "reference": "fb3933512008d8162b3cdf9e18dba9309b7c3773",
+                "url": "https://api.github.com/repos/phpDocumentor/TypeResolver/zipball/9c977708995954784726e25d0cd1dddf4e65b0f7",
+                "reference": "9c977708995954784726e25d0cd1dddf4e65b0f7",
                 "shasum": ""
             },
             "require": {
@@ -1293,26 +1293,26 @@
                     "email": "me@mikevanriel.com"
                 }
             ],
-            "time": "2017-06-03 08:32:36"
+            "time": "2017-07-14 14:27:02"
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.7.0",
+            "version": "v1.7.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
+                "reference": "c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
-                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6",
+                "reference": "c9b8c6088acd19d769d4cc0ffa60a9fe34344bd6",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
-                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2|^4.0",
                 "sebastian/comparator": "^1.1|^2.0",
                 "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
@@ -1323,7 +1323,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.6.x-dev"
+                    "dev-master": "1.7.x-dev"
                 }
             },
             "autoload": {
@@ -1356,7 +1356,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2017-03-02 20:05:34"
+            "time": "2017-09-04 11:05:03"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -1560,16 +1560,16 @@
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "2.0.0",
+            "version": "2.0.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "ecb0b2cdaa0add708fe6f329ef65ae0c5225130b"
+                "reference": "9a02332089ac48e704c70f6cefed30c224e3c0b0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/ecb0b2cdaa0add708fe6f329ef65ae0c5225130b",
-                "reference": "ecb0b2cdaa0add708fe6f329ef65ae0c5225130b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/9a02332089ac48e704c70f6cefed30c224e3c0b0",
+                "reference": "9a02332089ac48e704c70f6cefed30c224e3c0b0",
                 "shasum": ""
             },
             "require": {
@@ -1605,7 +1605,7 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2017-08-03 14:17:41"
+            "time": "2017-08-20 05:47:52"
         },
         {
             "name": "phpunit/phpunit",
@@ -1750,10 +1750,10 @@
         },
         {
             "name": "rg3/youtube-dl",
-            "version": "2017.05.09",
+            "version": "2017.09.11",
             "dist": {
                 "type": "zip",
-                "url": "https://github.com/rg3/youtube-dl/archive/2017.05.09.zip",
+                "url": "https://github.com/rg3/youtube-dl/archive/2017.09.11.zip",
                 "reference": null,
                 "shasum": null
             },
@@ -2353,16 +2353,16 @@
         },
         {
             "name": "symfony/polyfill-mbstring",
-            "version": "v1.4.0",
+            "version": "v1.5.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/polyfill-mbstring.git",
-                "reference": "f29dca382a6485c3cbe6379f0c61230167681937"
+                "reference": "7c8fae0ac1d216eb54349e6a8baa57d515fe8803"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/f29dca382a6485c3cbe6379f0c61230167681937",
-                "reference": "f29dca382a6485c3cbe6379f0c61230167681937",
+                "url": "https://api.github.com/repos/symfony/polyfill-mbstring/zipball/7c8fae0ac1d216eb54349e6a8baa57d515fe8803",
+                "reference": "7c8fae0ac1d216eb54349e6a8baa57d515fe8803",
                 "shasum": ""
             },
             "require": {
@@ -2374,7 +2374,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4-dev"
+                    "dev-master": "1.5-dev"
                 }
             },
             "autoload": {
@@ -2408,7 +2408,7 @@
                 "portable",
                 "shim"
             ],
-            "time": "2017-06-09 14:24:12"
+            "time": "2017-06-14 15:44:48"
         },
         {
             "name": "symfony/var-dumper",
diff --git a/i18n/fr_FR/LC_MESSAGES/Alltube.po b/i18n/fr_FR/LC_MESSAGES/Alltube.po
index ff30f25..c35f23f 100644
--- a/i18n/fr_FR/LC_MESSAGES/Alltube.po
+++ b/i18n/fr_FR/LC_MESSAGES/Alltube.po
@@ -8,7 +8,7 @@ msgstr ""
 "Language: fr\n"
 
 #: templates/error.tpl:5
-msgid "An error occured"
+msgid "An error occurred"
 msgstr "Une erreur est survenue"
 
 #: templates/error.tpl:6
@@ -131,4 +131,3 @@ msgstr "Bookmarklet"
 #: templates/inc/header.tpl:4
 msgid "Switch language"
 msgstr "Changer de langue"
-
diff --git a/i18n/template.pot b/i18n/template.pot
index 4cb1d42..e7712c6 100644
--- a/i18n/template.pot
+++ b/i18n/template.pot
@@ -2,7 +2,7 @@ msgid ""
 msgstr "Content-Type: text/plain; charset=UTF-8\n"
 
 #: templates/error.tpl:5
-msgid "An error occured"
+msgid "An error occurred"
 msgstr ""
 
 #: templates/error.tpl:6
diff --git a/i18n/zh_CN/LC_MESSAGES/Alltube.po b/i18n/zh_CN/LC_MESSAGES/Alltube.po
index d0bc3e0..b30a5af 100644
--- a/i18n/zh_CN/LC_MESSAGES/Alltube.po
+++ b/i18n/zh_CN/LC_MESSAGES/Alltube.po
@@ -13,7 +13,7 @@ msgstr ""
 "Plural-Forms: nplurals=1; plural=0;\n"
 
 #: ..\..\..\templates/error.tpl:5
-msgid "An error occured"
+msgid "An error occurred"
 msgstr "出错了"
 
 #: ..\..\..\templates/error.tpl:6
diff --git a/templates/error.tpl b/templates/error.tpl
index ded9676..d2f85b0 100644
--- a/templates/error.tpl
+++ b/templates/error.tpl
@@ -2,7 +2,7 @@
 <div class="wrapper">
     <div class="main error">
     {include file="inc/logo.tpl"}
-    <h2>{t}An error occured{/t}</h2>
+    <h2>{t}An error occurred{/t}</h2>
     {t}Please check the URL of your video.{/t}
     <p><i>
     {foreach $errors as $error}