diff --git a/requirements.txt b/requirements.txt
index 7922dbe4..6d413a2c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,3 +10,4 @@ cbor==1.0.0
 cryptography==2.6.1
 scapy>=2.4.3
 codespell==1.16.0
+protobuf==3.10.0