diff --git a/requirements.txt b/requirements.txt
index c76cda9..5b12b1a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,7 +48,7 @@ pbr==3.1.1
 pexpect==4.2.1
 pickleshare==0.7.4
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.18.3
 ptyprocess==0.5.2
 pyasn1==0.3.2
 pyasn1-modules==0.0.11