diff --git a/requirements.txt b/requirements.txt
index 2d6a9bb..7691c43 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -33,7 +33,7 @@ opt-einsum==3.2.0
 packaging==20.1
 pluggy==0.13.1
 pre-commit==2.0.1
-protobuf==3.11.3
+protobuf==3.15.0
 py==1.10.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8