diff --git a/requirements.txt b/requirements.txt
index c5e6599..d13cac4 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ mkl-random==1.1.0
 mkl-service==2.3.0
 numpy==1.18.1
 opt-einsum==3.1.0
-protobuf==3.11.2
+protobuf==3.15.0
 scipy==1.4.1
 six==1.14.0
 tensorboard==2.0.0