diff --git a/chat/indico_chat/plugin.py b/chat/indico_chat/plugin.py
index 95b4c79..df07ef1 100644
--- a/chat/indico_chat/plugin.py
+++ b/chat/indico_chat/plugin.py
@@ -44,7 +44,8 @@ from indico_chat.views import WPChatEventMgmt
 
 
 class SettingsForm(IndicoForm):
-    admins = PrincipalField(_('Administrators'), description=_('Users who can manage chatrooms for all events'))
+    admins = PrincipalField(_('Administrators'), allow_external=False,
+                            description=_('Users who can manage chatrooms for all events'))
     server = StringField(_('XMPP server'), [DataRequired()], description=_('The hostname of the XMPP server'))
     muc_server = StringField(_('XMPP MUC server'), [DataRequired()],
                              description=_("The hostname of the XMPP MUC server"))
diff --git a/chat/setup.py b/chat/setup.py
index 783ce34..b74a7ed 100644
--- a/chat/setup.py
+++ b/chat/setup.py
@@ -21,7 +21,7 @@ from setuptools import setup, find_packages
 
 setup(
     name='indico_chat',
-    version='0.1',
+    version='0.2',
     url='https://github.com/indico/indico-plugins',
     license='https://www.gnu.org/licenses/gpl-3.0.txt',
     author='Indico Team',
@@ -31,7 +31,7 @@ setup(
     include_package_data=True,
     platforms='any',
     install_requires=[
-        'indico>=1.9.1',
+        'indico>=1.9.2',
         'sleekxmpp'
     ],
     classifiers=[