diff --git a/requirements.txt b/requirements.txt
index 6dfbde1..e34465a 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -47,7 +47,7 @@ plac==0.9.6
 plotly==4.1.0
 pluggy==0.12.0
 preshed==2.0.1
-protobuf==3.9.1
+protobuf==3.15.0
 py==1.8.0
 pyasn1==0.4.6
 Pygments==2.4.2