diff --git a/requirements.txt b/requirements.txt
index 92ff323..a726481 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -23,7 +23,7 @@ networkx==2.3
 numpy==1.16.4
 opencv-python==3.3.0.9
 Pillow==6.1.0
-protobuf==3.9.0
+protobuf==3.15.0
 pyparsing==2.4.0
 python-dateutil==2.8.0
 PyWavelets==1.0.3