diff --git a/FOTS/requirements_FOTS.txt b/FOTS/requirements_FOTS.txt
index 9331164..adb2a0b 100644
--- a/FOTS/requirements_FOTS.txt
+++ b/FOTS/requirements_FOTS.txt
@@ -23,7 +23,7 @@ numpy==1.19.0
 opencv-python==4.2.0.34
 Pillow==7.1.2
 plumbum==1.6.9
-protobuf==3.12.2
+protobuf==3.18.3
 pyparsing==2.4.7
 python-dateutil==2.8.1
 requests==2.24.0