diff --git a/src/backend/middleware/requirements.txt b/src/backend/middleware/requirements.txt
index e6f7851..10a6bc1 100644
--- a/src/backend/middleware/requirements.txt
+++ b/src/backend/middleware/requirements.txt
@@ -23,7 +23,7 @@ MarkupSafe==1.1.1
 packaging==20.9
 pluggy==0.13.1
 proto-plus==1.14.2
-protobuf==3.15.3
+protobuf==3.18.3
 py==1.10.0
 pyasn1==0.4.8
 pyasn1-modules==0.2.8