diff --git a/.isort.cfg b/.isort.cfg
index f55fec7..d535851 100644
--- a/.isort.cfg
+++ b/.isort.cfg
@@ -9,7 +9,6 @@ known_third_party =
     simplejson
     six,
     stix2patterns,
-    stix2validator,
     taxii2client,
 known_first_party = stix2
 force_sort_within_sections = 1
diff --git a/setup.py b/setup.py
index e359147..75b5a43 100644
--- a/setup.py
+++ b/setup.py
@@ -53,7 +53,6 @@ setup(
         'simplejson',
         'six',
         'stix2-patterns',
-        'stix2-validator',
         'taxii2-client',
     ],
 )