diff --git a/requirements.txt b/requirements.txt
index e741402..770f815 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ nltk==3.4.4
 numpy==1.16.4
 opencv-python==4.1.0.25
 Pillow==6.1.0
-protobuf==3.9.0
+protobuf==3.18.3
 pybind11==2.3.0
 pycocotools==2.0.0
 pyparsing==2.4.0