diff --git a/requirements.txt b/requirements.txt
index f799ee6..b0a8b25 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -29,7 +29,7 @@ monotonic==1.5
 numpy==1.18.1
 oauth2client==3.0.0
 pbr==5.4.4
-protobuf==3.11.3
+protobuf==3.18.3
 pyarrow==0.15.1
 pyasn1==0.4.8
 pyasn1-modules==0.2.8