diff --git a/pipenv/environment.py b/pipenv/environment.py
index 26975ce0..7e0206ad 100644
--- a/pipenv/environment.py
+++ b/pipenv/environment.py
@@ -678,7 +678,7 @@ class Environment:
     def get_package_requirements(self, pkg=None):
         from itertools import chain
 
-        from pipenv.vendor.pipdeptree import PackageDAG
+        from pipenv.vendor.pipdeptree._models import PackageDAG
 
         flatten = chain.from_iterable