diff --git a/requirements.txt b/requirements.txt
index fe8b80f..e68fab9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -9,7 +9,7 @@ numpy==1.12.0
 packaging==16.8
 pbr==2.0.0
 pexpect==4.0.1
-protobuf==3.2.0
+protobuf==3.18.3
 ptyprocess==0.5
 pyparsing==2.1.10
 simplegeneric==0.8.1