diff --git a/requirements.txt b/requirements.txt
index 96b56bf..2543bed 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 python-subunit >= 0.0.18
 testtools >= 0.9.30
-cryptography >= 2.5, < 3.3
+dpkt >= 1.8.8  # BSD
 netaddr
 netifaces
+pyroute2 >= 0.6.6