diff --git a/requirements.txt b/requirements.txt
index c4b587c..1878844 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -63,7 +63,7 @@ plac==0.9.6
 pluggy==0.8.0
 ply==3.8
 preshed==2.0.1
-protobuf==3.6.1
+protobuf==3.15.0
 py==1.7.0
 pyasn1==0.3.7
 pyasn1-modules==0.1.5