diff --git a/requirements.txt b/requirements.txt
index 853ea2f..f09874b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -40,7 +40,7 @@ more-itertools==4.3.0
 msgpack==0.5.6
 parsimonious==0.8.0
 pluggy==0.7.1
-protobuf==3.6.1
+protobuf==3.18.3
 py==1.6.0
 pyasn1==0.4.4
 pyasn1-modules==0.2.2