diff --git a/requirements.txt b/requirements.txt
index 955694a..ad12794 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,7 +24,7 @@ numpy==1.15.4
 opencv-python==4.0.0.21
 Pillow==6.2.0
 pkg-resources==0.0.0
-protobuf==3.6.1
+protobuf==3.18.3
 pydensecrf==1.0rc2
 pyparsing==2.3.1
 python-dateutil==2.7.5