diff --git a/bin/acme b/bin/acme
index 1757f2f..be8da69 100755
--- a/bin/acme
+++ b/bin/acme
@@ -135,6 +135,7 @@ try {
 $injector = new Injector;
 $injector->share($climate);
 $injector->share(new AcmeFactory);
+$injector->share(new Amp\Artax\Client(new Amp\Artax\Cookie\NullCookieJar));
 
 $command = $injector->make($class);
 
diff --git a/composer.lock b/composer.lock
index cef47a1..ea71c5d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -65,16 +65,16 @@
         },
         {
             "name": "amphp/artax",
-            "version": "v2.0.5",
+            "version": "v2.0.6",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/artax.git",
-                "reference": "1795ed4076469546f79804b348ffd6dd77656f73"
+                "reference": "8ed34eb97685432b603fdf5b9279bd908333c814"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/artax/zipball/1795ed4076469546f79804b348ffd6dd77656f73",
-                "reference": "1795ed4076469546f79804b348ffd6dd77656f73",
+                "url": "https://api.github.com/repos/amphp/artax/zipball/8ed34eb97685432b603fdf5b9279bd908333c814",
+                "reference": "8ed34eb97685432b603fdf5b9279bd908333c814",
                 "shasum": ""
             },
             "require": {
@@ -119,7 +119,7 @@
                 "parallel",
                 "rest"
             ],
-            "time": "2016-08-08T16:27:01+00:00"
+            "time": "2017-05-09T19:47:08+00:00"
         },
         {
             "name": "amphp/cache",
@@ -171,16 +171,16 @@
         },
         {
             "name": "amphp/dns",
-            "version": "v0.8.12",
+            "version": "v0.8.14",
             "source": {
                 "type": "git",
                 "url": "https://github.com/amphp/dns.git",
-                "reference": "0b0ef2b82d7307d57e624042aac8862f5115ad12"
+                "reference": "5fc1cde2d29e94d731ab96d5ef5f9f20958315cc"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/amphp/dns/zipball/0b0ef2b82d7307d57e624042aac8862f5115ad12",
-                "reference": "0b0ef2b82d7307d57e624042aac8862f5115ad12",
+                "url": "https://api.github.com/repos/amphp/dns/zipball/5fc1cde2d29e94d731ab96d5ef5f9f20958315cc",
+                "reference": "5fc1cde2d29e94d731ab96d5ef5f9f20958315cc",
                 "shasum": ""
             },
             "require": {
@@ -193,6 +193,7 @@
             },
             "require-dev": {
                 "friendsofphp/php-cs-fixer": "^1.9",
+                "phpunit/php-code-coverage": ">=2.2",
                 "phpunit/phpunit": "^4.8|^5.1.3"
             },
             "type": "library",
@@ -236,7 +237,7 @@
                 "dns",
                 "resolve"
             ],
-            "time": "2017-01-05T00:13:28+00:00"
+            "time": "2017-02-05T22:17:40+00:00"
         },
         {
             "name": "amphp/file",
@@ -686,16 +687,16 @@
         },
         {
             "name": "phpseclib/phpseclib",
-            "version": "2.0.4",
+            "version": "2.0.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpseclib/phpseclib.git",
-                "reference": "ab8028c93c03cc8d9c824efa75dc94f1db2369bf"
+                "reference": "f8dd0e18d2328c447dd4190fecd11ef52680d968"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/ab8028c93c03cc8d9c824efa75dc94f1db2369bf",
-                "reference": "ab8028c93c03cc8d9c824efa75dc94f1db2369bf",
+                "url": "https://api.github.com/repos/phpseclib/phpseclib/zipball/f8dd0e18d2328c447dd4190fecd11ef52680d968",
+                "reference": "f8dd0e18d2328c447dd4190fecd11ef52680d968",
                 "shasum": ""
             },
             "require": {
@@ -774,20 +775,20 @@
                 "x.509",
                 "x509"
             ],
-            "time": "2016-10-04T00:57:04+00:00"
+            "time": "2017-05-08T05:58:35+00:00"
         },
         {
             "name": "rdlowrey/auryn",
-            "version": "v1.4.0",
+            "version": "v1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/rdlowrey/auryn.git",
-                "reference": "2e4240791162dfe073d59654d8dc06df0eb0b73f"
+                "reference": "c6c92ec081c707f7e9e0a69185665147b30d66de"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/rdlowrey/auryn/zipball/2e4240791162dfe073d59654d8dc06df0eb0b73f",
-                "reference": "2e4240791162dfe073d59654d8dc06df0eb0b73f",
+                "url": "https://api.github.com/repos/rdlowrey/auryn/zipball/c6c92ec081c707f7e9e0a69185665147b30d66de",
+                "reference": "c6c92ec081c707f7e9e0a69185665147b30d66de",
                 "shasum": ""
             },
             "require": {
@@ -835,27 +836,27 @@
                 "dic",
                 "ioc"
             ],
-            "time": "2016-03-14T20:10:19+00:00"
+            "time": "2017-04-07T16:12:28+00:00"
         },
         {
             "name": "sabre/uri",
-            "version": "1.2.0",
+            "version": "1.2.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/fruux/sabre-uri.git",
-                "reference": "8545a3335f741d4b7700bb14efb41b4c03775dcd"
+                "reference": "ada354d83579565949d80b2e15593c2371225e61"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/fruux/sabre-uri/zipball/8545a3335f741d4b7700bb14efb41b4c03775dcd",
-                "reference": "8545a3335f741d4b7700bb14efb41b4c03775dcd",
+                "url": "https://api.github.com/repos/fruux/sabre-uri/zipball/ada354d83579565949d80b2e15593c2371225e61",
+                "reference": "ada354d83579565949d80b2e15593c2371225e61",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.4.7"
             },
             "require-dev": {
-                "phpunit/phpunit": "*",
+                "phpunit/phpunit": ">=4.0,<6.0",
                 "sabre/cs": "~1.0.0"
             },
             "type": "library",
@@ -886,20 +887,20 @@
                 "uri",
                 "url"
             ],
-            "time": "2016-12-07T01:17:59+00:00"
+            "time": "2017-02-20T19:59:28+00:00"
         },
         {
             "name": "seld/cli-prompt",
-            "version": "1.0.2",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/cli-prompt.git",
-                "reference": "8cbe10923cae5bcd7c5a713f6703fc4727c8c1b4"
+                "reference": "a19a7376a4689d4d94cab66ab4f3c816019ba8dd"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/cli-prompt/zipball/8cbe10923cae5bcd7c5a713f6703fc4727c8c1b4",
-                "reference": "8cbe10923cae5bcd7c5a713f6703fc4727c8c1b4",
+                "url": "https://api.github.com/repos/Seldaek/cli-prompt/zipball/a19a7376a4689d4d94cab66ab4f3c816019ba8dd",
+                "reference": "a19a7376a4689d4d94cab66ab4f3c816019ba8dd",
                 "shasum": ""
             },
             "require": {
@@ -934,7 +935,7 @@
                 "input",
                 "prompt"
             ],
-            "time": "2016-04-18T09:31:41+00:00"
+            "time": "2017-03-18T11:32:45+00:00"
         },
         {
             "name": "symfony/polyfill-php56",
@@ -1046,16 +1047,16 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v3.2.1",
+            "version": "v3.2.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/symfony/yaml.git",
-                "reference": "a7095af4b97a0955f85c8989106c249fa649011f"
+                "reference": "acec26fcf7f3031e094e910b94b002fa53d4e4d6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/yaml/zipball/a7095af4b97a0955f85c8989106c249fa649011f",
-                "reference": "a7095af4b97a0955f85c8989106c249fa649011f",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/acec26fcf7f3031e094e910b94b002fa53d4e4d6",
+                "reference": "acec26fcf7f3031e094e910b94b002fa53d4e4d6",
                 "shasum": ""
             },
             "require": {
@@ -1097,7 +1098,7 @@
             ],
             "description": "Symfony Yaml Component",
             "homepage": "https://symfony.com",
-            "time": "2016-12-10T10:07:06+00:00"
+            "time": "2017-05-01T14:55:58+00:00"
         },
         {
             "name": "webmozart/assert",
@@ -1207,35 +1208,35 @@
         },
         {
             "name": "friendsofphp/php-cs-fixer",
-            "version": "v1.11.8",
+            "version": "v1.13.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/FriendsOfPHP/PHP-CS-Fixer.git",
-                "reference": "117137e9970054d022b7656209f094dab852b90c"
+                "reference": "0ea4f7ed06ca55da1d8fc45da26ff87f261c4088"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/117137e9970054d022b7656209f094dab852b90c",
-                "reference": "117137e9970054d022b7656209f094dab852b90c",
+                "url": "https://api.github.com/repos/FriendsOfPHP/PHP-CS-Fixer/zipball/0ea4f7ed06ca55da1d8fc45da26ff87f261c4088",
+                "reference": "0ea4f7ed06ca55da1d8fc45da26ff87f261c4088",
                 "shasum": ""
             },
             "require": {
                 "ext-tokenizer": "*",
-                "php": ">=5.3.6",
-                "sebastian/diff": "~1.1",
-                "symfony/console": "~2.3|~3.0",
-                "symfony/event-dispatcher": "~2.1|~3.0",
-                "symfony/filesystem": "~2.1|~3.0",
-                "symfony/finder": "~2.1|~3.0",
-                "symfony/process": "~2.3|~3.0",
-                "symfony/stopwatch": "~2.5|~3.0"
+                "php": "^5.3.6 || >=7.0 <7.2",
+                "sebastian/diff": "^1.1",
+                "symfony/console": "^2.3 || ^3.0",
+                "symfony/event-dispatcher": "^2.1 || ^3.0",
+                "symfony/filesystem": "^2.1 || ^3.0",
+                "symfony/finder": "^2.1 || ^3.0",
+                "symfony/process": "^2.3 || ^3.0",
+                "symfony/stopwatch": "^2.5 || ^3.0"
             },
             "conflict": {
                 "hhvm": "<3.9"
             },
             "require-dev": {
                 "phpunit/phpunit": "^4.5|^5",
-                "satooshi/php-coveralls": "^0.7.1"
+                "satooshi/php-coveralls": "^1.0"
             },
             "bin": [
                 "php-cs-fixer"
@@ -1261,7 +1262,7 @@
                 }
             ],
             "description": "A tool to automatically fix PHP code style",
-            "time": "2016-08-16T23:31:05+00:00"
+            "time": "2016-12-01T00:05:05+00:00"
         },
         {
             "name": "league/event",
@@ -1423,16 +1424,16 @@
         },
         {
             "name": "myclabs/deep-copy",
-            "version": "1.5.5",
+            "version": "1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/myclabs/DeepCopy.git",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108"
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/399c1f9781e222f6eb6cc238796f5200d1b7f108",
-                "reference": "399c1f9781e222f6eb6cc238796f5200d1b7f108",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/8e6e04167378abf1ddb4d3522d8755c5fd90d102",
+                "reference": "8e6e04167378abf1ddb4d3522d8755c5fd90d102",
                 "shasum": ""
             },
             "require": {
@@ -1461,7 +1462,7 @@
                 "object",
                 "object graph"
             ],
-            "time": "2016-10-31T17:19:45+00:00"
+            "time": "2017-04-12T18:52:22+00:00"
         },
         {
             "name": "neutron/signal-handler",
@@ -1654,27 +1655,27 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.6.2",
+            "version": "v1.7.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb"
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/6c52c2722f8460122f96f86346600e1077ce22cb",
-                "reference": "6c52c2722f8460122f96f86346600e1077ce22cb",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/93d39f1f7f9326d746203c7c056f300f7f126073",
+                "reference": "93d39f1f7f9326d746203c7c056f300f7f126073",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
                 "php": "^5.3|^7.0",
                 "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
-                "sebastian/comparator": "^1.1",
-                "sebastian/recursion-context": "^1.0|^2.0"
+                "sebastian/comparator": "^1.1|^2.0",
+                "sebastian/recursion-context": "^1.0|^2.0|^3.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "^2.0",
+                "phpspec/phpspec": "^2.5|^3.2",
                 "phpunit/phpunit": "^4.8 || ^5.6.5"
             },
             "type": "library",
@@ -1713,39 +1714,39 @@
                 "spy",
                 "stub"
             ],
-            "time": "2016-11-21T14:58:47+00:00"
+            "time": "2017-03-02T20:05:34+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
-            "version": "4.0.4",
+            "version": "4.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a"
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/c14196e64a78570034afd0b7a9f3757ba71c2a0a",
-                "reference": "c14196e64a78570034afd0b7a9f3757ba71c2a0a",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
+                "reference": "ef7b2f56815df854e66ceaee8ebe9393ae36a40d",
                 "shasum": ""
             },
             "require": {
+                "ext-dom": "*",
+                "ext-xmlwriter": "*",
                 "php": "^5.6 || ^7.0",
-                "phpunit/php-file-iterator": "~1.3",
-                "phpunit/php-text-template": "~1.2",
-                "phpunit/php-token-stream": "^1.4.2",
-                "sebastian/code-unit-reverse-lookup": "~1.0",
+                "phpunit/php-file-iterator": "^1.3",
+                "phpunit/php-text-template": "^1.2",
+                "phpunit/php-token-stream": "^1.4.2 || ^2.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0",
                 "sebastian/environment": "^1.3.2 || ^2.0",
-                "sebastian/version": "~1.0|~2.0"
+                "sebastian/version": "^1.0 || ^2.0"
             },
             "require-dev": {
-                "ext-xdebug": ">=2.1.4",
-                "phpunit/phpunit": "^5.4"
+                "ext-xdebug": "^2.1.4",
+                "phpunit/phpunit": "^5.7"
             },
             "suggest": {
-                "ext-dom": "*",
-                "ext-xdebug": ">=2.4.0",
-                "ext-xmlwriter": "*"
+                "ext-xdebug": "^2.5.1"
             },
             "type": "library",
             "extra": {
@@ -1776,7 +1777,7 @@
                 "testing",
                 "xunit"
             ],
-            "time": "2016-12-20T15:22:42+00:00"
+            "time": "2017-04-02T07:44:40+00:00"
         },
         {
             "name": "phpunit/php-file-iterator",
@@ -1868,25 +1869,30 @@
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.8",
+            "version": "1.0.9",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260"
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/38e9124049cf1a164f1e4537caf19c99bf1eb260",
-                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
+                "reference": "3dcf38ca72b158baf0bc245e9184d3fdffa9c46f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^5.3.3 || ^7.0"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4|~5"
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || ^6.0"
             },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0-dev"
+                }
+            },
             "autoload": {
                 "classmap": [
                     "src/"
@@ -1908,20 +1914,20 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2016-05-12T18:03:57+00:00"
+            "time": "2017-02-26T11:10:40+00:00"
         },
         {
             "name": "phpunit/php-token-stream",
-            "version": "1.4.9",
+            "version": "1.4.11",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-token-stream.git",
-                "reference": "3b402f65a4cc90abf6e1104e388b896ce209631b"
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/3b402f65a4cc90abf6e1104e388b896ce209631b",
-                "reference": "3b402f65a4cc90abf6e1104e388b896ce209631b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-token-stream/zipball/e03f8f67534427a787e21a385a67ec3ca6978ea7",
+                "reference": "e03f8f67534427a787e21a385a67ec3ca6978ea7",
                 "shasum": ""
             },
             "require": {
@@ -1957,20 +1963,20 @@
             "keywords": [
                 "tokenizer"
             ],
-            "time": "2016-11-15T14:06:22+00:00"
+            "time": "2017-02-27T10:12:30+00:00"
         },
         {
             "name": "phpunit/phpunit",
-            "version": "5.7.5",
+            "version": "5.7.19",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/phpunit.git",
-                "reference": "50fd2be8f3e23e91da825f36f08e5f9633076ffe"
+                "reference": "69c4f49ff376af2692bad9cebd883d17ebaa98a1"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/50fd2be8f3e23e91da825f36f08e5f9633076ffe",
-                "reference": "50fd2be8f3e23e91da825f36f08e5f9633076ffe",
+                "url": "https://api.github.com/repos/sebastianbergmann/phpunit/zipball/69c4f49ff376af2692bad9cebd883d17ebaa98a1",
+                "reference": "69c4f49ff376af2692bad9cebd883d17ebaa98a1",
                 "shasum": ""
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