diff --git a/requirements.txt b/requirements.txt
index a248cfd..fce34e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -25,7 +25,7 @@ MarkupSafe==1.0
 matplotlib==2.1.0
 numpy==1.13.3
 placebo==0.8.1
-protobuf==3.4.0
+protobuf==3.15.0
 pyclipper==1.0.6
 pyparsing==2.2.0
 python-dateutil==2.6.1