diff --git a/nxpd/nx_pydot.py b/nxpd/nx_pydot.py
index 1a98b8d..6ffca20 100644
--- a/nxpd/nx_pydot.py
+++ b/nxpd/nx_pydot.py
@@ -246,7 +246,7 @@ def to_pydot(G, raise_exceptions=True):
     else:
         graph_type = 'graph'
 
-    strict = G.number_of_selfloops() == 0 and not G.is_multigraph()
+    strict = nx.number_of_selfloops(G) == 0 and not G.is_multigraph()
 
     # Create the Pydot graph.
     name = G.graph.get('name')
diff --git a/setup.py b/setup.py
index 845ae94..bb4c9ef 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
 def main():
 
     install_requires = [
-        'networkx >= 1.6',
+        'networkx >= 2.0',
         'pyparsing >= 2.0.1',
     ]