diff --git a/requirements.txt b/requirements.txt
index 61e7432..6841963 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -35,7 +35,7 @@ opt-einsum==3.1.0
 packaging==20.1
 Pillow==7.0.0
 pluggy==0.13.1
-protobuf==3.11.2
+protobuf==3.15.0
 py==1.8.1
 pyasn1==0.4.8
 pyasn1-modules==0.2.8