diff --git a/requirements.txt b/requirements.txt
index 81fea3f..6e5db66 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 numpy==1.17.0
 opencv-python==4.1.0.25
 pillow>=6.2.0
-protobuf==3.9.0
+protobuf==3.18.3
 PyYAML==5.1.1
 scipy==1.3.0
 six==1.12.0