diff --git a/requirements.txt b/requirements.txt
index 2dd7e01..f03a612 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ matplotlib==3.0.2
 mne==0.17.0
 numpy==1.16.1
 pandas==0.24.1
-protobuf==3.6.1
+protobuf==3.15.0
 pyparsing==2.3.1
 python-dateutil==2.8.0
 pytz==2018.9