diff --git a/requirements.txt b/requirements.txt
index 4f39a13..be5f971 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ MarkupSafe==1.1.1
 numpy==1.16.1
 opencv-python==4.0.0.21
 Pillow==6.2.0
-protobuf==3.6.1
+protobuf==3.18.3
 pyyaml>=4.2b1
 scipy==1.2.1
 six==1.12.0