diff --git a/dev-requirements.txt b/dev-requirements.txt
index a82e4a2c..f646b728 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,6 +1,6 @@
 -rrequirements.txt
 
-sphinx==1.7.1
-pytest==4.0.0
+sphinx==1.8.2
+pytest==4.0.1
 pep8==1.7.1
 pytest-timeout==1.3.3
diff --git a/gns3server/controller/__init__.py b/gns3server/controller/__init__.py
index 196446ec..8a743a8d 100644
--- a/gns3server/controller/__init__.py
+++ b/gns3server/controller/__init__.py
@@ -341,7 +341,7 @@ class Controller:
         if "appliances" in controller_settings:
             for appliance_settings in controller_settings["appliances"]:
                 try:
-                    appliance = Appliance(appliance_settings["appliance_id"], appliance_settings)
+                    appliance = Appliance(appliance_settings.get("appliance_id"), appliance_settings)
                     self._appliances[appliance.id] = appliance
                 except jsonschema.ValidationError as e:
                     message = "Cannot load appliance with JSON data '{}': {}".format(appliance_settings, e.message)