diff --git a/requirements.txt b/requirements.txt
index 0707976..a171229 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@ Markdown==3.2.1
 numpy==1.16.0
 oauthlib==3.1.0
 opt-einsum==3.1.0
-protobuf==3.11.3
+protobuf==3.15.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 requests==2.23.0