diff --git a/requirements.txt b/requirements.txt
index adc6c76..a65ad60 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,7 +37,7 @@ osrm==0.11.3
 pandas==0.19.2
 plotly==3.5.0
 polyline==1.3.2
-protobuf==3.6.1
+protobuf==3.18.3
 pyparsing==2.3.0
 pyproj==1.9.5.1
 python-dateutil==2.7.5