diff --git a/django_netjsongraph/settings.py b/django_netjsongraph/settings.py
index 1849f5f..1997e04 100644
--- a/django_netjsongraph/settings.py
+++ b/django_netjsongraph/settings.py
@@ -6,6 +6,7 @@
     ('netdiff.BmxParser', 'BMX6 (q6m)'),
     ('netdiff.NetJsonParser', 'NetJSON NetworkGraph'),
     ('netdiff.CnmlParser', 'CNML 1.0'),
+    ('netdiff.OpenvpnParser', 'OpenVPN')
 ]
 
 PARSERS = DEFAULT_PARSERS + getattr(settings, 'NETJSONGRAPH_PARSERS', [])
diff --git a/requirements.txt b/requirements.txt
index 5584ae5..c4ce6c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 django>=1.11,<1.12
 djangorestframework>=3.3,<3.7
 django-model-utils
-netdiff>=0.5.0,<=6.0
+netdiff>=0.5.1,<=6.0
 openwisp-utils>=0.1.2,<0.2
 jsonfield
 six