diff --git a/requirements.txt b/requirements.txt
index 1a12257..ad81b45 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -59,7 +59,7 @@ plac==1.1.3
 portend==2.6
 preshed==3.0.2
 promise==2.3
-protobuf==3.11.3
+protobuf==3.15.0
 psutil==5.7.0
 pyasn1-modules==0.2.8
 pyasn1==0.4.8