diff --git a/setup.py b/setup.py
index 5edf20f..9700ec8 100644
--- a/setup.py
+++ b/setup.py
@@ -54,4 +54,7 @@ setup(
         'six',
         'stix2-patterns',
     ],
+    extras_require={
+        'taxii': ['taxii2-client']
+    }
 )