diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b6fe465
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+/*.dot
+/*.png
+/*.svg
diff --git a/ontology_viz.py b/ontology_viz.py
index 83a0e00..25a4849 100644
--- a/ontology_viz.py
+++ b/ontology_viz.py
@@ -50,7 +50,7 @@ def _load_files(graph, files, format='ttl'):
         if isinstance(files, str):
             files = [files]
         for file in files:
-            graph.load(file, format=format)
+            graph.parse(file, format=format)
 
     def _read_graph(self):
         for s, p, o in self.g:
diff --git a/requirements.txt b/requirements.txt
index 86c28f5..f178d79 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-rdflib >= 6.0.0, < 7.0.0
-graphviz == 0.17
+rdflib==6.2.0
+graphviz==0.20.1