diff --git a/composer.json b/composer.json
index 3809941..04a4fc8 100644
--- a/composer.json
+++ b/composer.json
@@ -6,8 +6,8 @@
         "ext-posix": "*",
         "ext-openssl": "*",
         "bramus/monolog-colored-line-formatter": "^2",
-        "kelunik/acme": "dev-master",
-        "kelunik/certificate": "dev-master",
+        "kelunik/acme": "^0.3",
+        "kelunik/certificate": "^1",
         "league/climate": "^3",
         "monolog/monolog": "^1.17",
         "psr/log": "^1",
diff --git a/src/Commands/Issue.php b/src/Commands/Issue.php
index 966db13..7337498 100644
--- a/src/Commands/Issue.php
+++ b/src/Commands/Issue.php
@@ -32,11 +32,16 @@ class Issue implements Command {
 
     private function doExecute(Manager $args): Generator {
         if (posix_geteuid() !== 0) {
-            throw new AcmeException("Please run this script as root!");
+            $processUser = posix_getpwuid(posix_geteuid());
+            $currentUsername = $processUser['name'];
+            $user = $args->get("user") ?? $currentUsername;
+            if ($currentUsername !== $user) {
+                throw new AcmeException("Running this script with --user only works as root");
+            }
+        } else {
+            $user = $args->get("user") ?? "www-data";
         }
 
-        $user = $args->get("user") ?? "www-data";
-
         $server = $args->get("server");
         $protocol = substr($server, 0, strpos("://", $server));
 
@@ -52,7 +57,7 @@ class Issue implements Command {
 
         $keyPair = $this->checkRegistration($args);
 
-        $acme = new AcmeService(new AcmeClient($server, $keyPair), $keyPair);
+        $acme = new AcmeService(new AcmeClient($server, $keyPair));
 
         foreach ($domains as $domain) {
             list($location, $challenges) = yield $acme->requestChallenges($domain);
@@ -70,7 +75,7 @@ class Issue implements Command {
             }
 
             $this->logger->debug("Generating payload...");
-            $payload = $acme->generateHttp01Payload($token);
+            $payload = $acme->generateHttp01Payload($keyPair, $token);
 
             $docRoot = rtrim($args->get("path") ?? __DIR__ . "/../../data/public", "/\\");
             $path = $docRoot . "/.well-known/acme-challenge";
@@ -95,9 +100,9 @@ class Issue implements Command {
 
                 file_put_contents("{$path}/{$token}", $payload);
                 chown("{$path}/{$token}", $userInfo["uid"]);
-                chmod("{$path}/{$token}", 0660);
+                chmod("{$path}/{$token}", 0664);
 
-                yield $acme->selfVerify($domain, $token, $payload);
+                yield $acme->verifyHttp01Challenge($domain, $token, $payload);
                 $this->logger->info("Successfully self-verified challenge.");
 
                 yield $acme->answerChallenge($challenge->uri, $payload);
diff --git a/src/Commands/Register.php b/src/Commands/Register.php
index ce145ea..68902e6 100644
--- a/src/Commands/Register.php
+++ b/src/Commands/Register.php
@@ -29,10 +29,6 @@ class Register implements Command {
     }
 
     public function doExecute(Manager $args): Generator {
-        if (posix_geteuid() !== 0) {
-            throw new AcmeException("Please run this script as root!");
-        }
-
         $email = $args->get("email");
         yield resolve($this->checkEmail($email));
 
@@ -70,11 +66,10 @@ class Register implements Command {
             file_put_contents($pathPrivate, $keyPair->getPrivate());
             file_put_contents($pathPublic, $keyPair->getPublic());
 
-            chmod($pathPrivate, 600);
-            chmod($pathPrivate, 600);
+            chmod($pathPrivate, 0600);
         }
 
-        $acme = new AcmeService(new AcmeClient($server, $keyPair), $keyPair);
+        $acme = new AcmeService(new AcmeClient($server, $keyPair));
 
         $this->logger->info("Registering with ACME server " . substr($server, 8) . " ...");
 
diff --git a/src/Commands/Revoke.php b/src/Commands/Revoke.php
index 6927a66..4fe1253 100644
--- a/src/Commands/Revoke.php
+++ b/src/Commands/Revoke.php
@@ -27,10 +27,6 @@ class Revoke implements Command {
     }
 
     private function doExecute(Manager $args): Generator {
-        if (posix_geteuid() !== 0) {
-            throw new AcmeException("Please run this script as root!");
-        }
-
         $server = $args->get("server");
         $protocol = substr($server, 0, strpos("://", $server));
 
@@ -41,7 +37,7 @@ class Revoke implements Command {
         }
 
         $keyPair = $this->checkRegistration($args);
-        $acme = new AcmeService(new AcmeClient($server, $keyPair), $keyPair);
+        $acme = new AcmeService(new AcmeClient($server, $keyPair));
 
         $this->logger->info("Revoking certificate ...");