diff --git a/example.robo.yml b/example.robo.yml
index 8ca8563..40a709c 100644
--- a/example.robo.yml
+++ b/example.robo.yml
@@ -1,5 +1,5 @@
 project:
-  version: "2.0"
+  version: "2.1"
   sites:
     default:
       sync:
@@ -11,3 +11,4 @@ project:
           url: https://srv.storage.com/sync/files.tar.gz
       develop:
         admin_username: user@mail.com
+        config_split: FALSE
diff --git a/src/Robo/Plugin/Commands/CommandBase.php b/src/Robo/Plugin/Commands/CommandBase.php
index 32c3ffa..7b419d8 100644
--- a/src/Robo/Plugin/Commands/CommandBase.php
+++ b/src/Robo/Plugin/Commands/CommandBase.php
@@ -16,7 +16,7 @@
  */
 class CommandBase extends \Robo\Tasks {
 
-  const FILE_FORMAT_VERSION = '2.0';
+  const FILE_FORMAT_VERSION = '2.1';
 
   /**
    * Check configuration file consistency.
@@ -62,12 +62,11 @@ protected function config($key) {
   protected function configSite($key, $site = 'default') {
     $config = Robo::config();
     $full = 'project.sites.' . $site . '.' . $key;
-    if ($value = $config->get($full)) {
-      return $value;
-    } else {
+    $value = $config->get($full);
+    if ($value === NULL) {
       $this->yell('Missing configuration key: ' . $full);
     }
-    return null;
+    return $value;
   }
 
   /**
diff --git a/src/Robo/Plugin/Commands/SiteCommands.php b/src/Robo/Plugin/Commands/SiteCommands.php
index e6fd660..328689f 100644
--- a/src/Robo/Plugin/Commands/SiteCommands.php
+++ b/src/Robo/Plugin/Commands/SiteCommands.php
@@ -2,8 +2,6 @@
 
 namespace EauDeWeb\Robo\Plugin\Commands;
 
-
-
 use Robo\Robo;
 use Symfony\Component\Console\Output\NullOutput;
 
@@ -57,6 +55,35 @@ public function siteDevelop($newPassword = 'password') {
     }
   }
 
+  /**
+   * Update the local instance: import configuration, update database, rebuild
+   * cache.
+   *
+   * @command site:update
+   *
+   * @return null|\Robo\Result
+   * @throws \EauDeWeb\Robo\InvalidConfigurationException
+   * @throws \Robo\Exception\TaskException
+   */
+  public function siteUpdate() {
+    $this->validateConfig();
+    $drush = $this->drushExecutable();
+    // Allow updatedb to fail once and execute it again after config:import.
+    $this->taskExec("{$drush} updatedb -y")->run();
+    $execStack = $this->taskExecStack()->stopOnFail(TRUE);
+    $execStack->exec("{$drush} cr");
+    if ($this->configSite('develop.config_split') === TRUE) {
+      $execStack->exec("{$drush} csim -y");
+    }
+    else {
+      $execStack->exec("{$drush} cim sync -y");
+    }
+    $execStack->exec("{$drush} updatedb -y");
+    $execStack->exec("{$drush} entup -y");
+    $execStack->exec("{$drush} cr");
+    return $execStack->run();
+  }
+
   /**
    * Create new configuration file.
    *