diff --git a/requirements.txt b/requirements.txt
index a434368..efbe43e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,7 +12,7 @@ Jinja2==2.10.3
 MarkupSafe==1.1.1
 opencensus==0.7.6
 opencensus-context==0.1.1
-protobuf==3.11.2
+protobuf==3.18.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.7
 PyJWT==1.7.1