diff --git a/requirements.txt b/requirements.txt
index 2817d7f..6e29db1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -60,7 +60,7 @@ pbr==5.0.0
 plac==0.9.6
 pluggy==0.8.0
 preshed==2.0.1
-protobuf==3.6.1
+protobuf==3.18.3
 py==1.7.0
 pyaml==17.12.1
 pyasn1==0.4.4