diff --git a/requirements.txt b/requirements.txt
index 749af48..7227a95 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,7 +22,7 @@ numpy==1.16.3
 onnx==1.5.0
 onnx-coreml==0.4.0
 Pillow==6.0.0
-protobuf==3.8.0
+protobuf==3.15.0
 pycparser==2.19
 python-dateutil==2.8.0
 python-dotenv==0.10.2