diff --git a/requirements.txt b/requirements.txt
index 62e7091..dd29e1d 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ oauth2client==4.1.2
 pbr==3.1.1
 proboscis==1.2.6.0
 prompt-toolkit==1.0.15
-protobuf==3.4.0
+protobuf==3.18.3
 ptpython==0.41
 pyasn1==0.3.3
 pyasn1-modules==0.1.1