diff --git a/topological_classifier/requirements.txt b/topological_classifier/requirements.txt
index cc003d8..17068d5 100644
--- a/topological_classifier/requirements.txt
+++ b/topological_classifier/requirements.txt
@@ -22,7 +22,7 @@ numpy==1.16.3
 pandas==0.24.2
 Pillow==6.0.0
 pkg-resources==0.0.0
-protobuf==3.7.1
+protobuf==3.18.3
 pyparsing==2.4.0
 python-dateutil==2.8.0
 pytz==2019.1