diff --git a/requirements.txt b/requirements.txt
index 328bc33..f9c9f0f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ packaging==20.1
 plac==0.9.6
 pluggy==0.13.1
 preshed==2.0.1
-protobuf==3.11.3
+protobuf==3.15.0
 py==1.8.1
 pyparsing==2.4.6
 pytest==5.3.5