diff --git a/requirements.txt b/requirements.txt
index b63ec01..c9eded9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -13,7 +13,7 @@ msgpack-numpy==0.4.4.3
 numpy==1.21.0
 opencv-python==4.2.0.32
 Pillow==8.3.2
-protobuf==3.15.0
+protobuf==3.18.3
 psutil==5.6.6
 pyzmq==18.1.0
 scikit-learn==0.21.3