diff --git a/src/recommendationservice/requirements.txt b/src/recommendationservice/requirements.txt
index b504fffe97d..68293e1670e 100644
--- a/src/recommendationservice/requirements.txt
+++ b/src/recommendationservice/requirements.txt
@@ -21,7 +21,7 @@ grpcio==1.16.1
 httplib2==0.12.0          # via google-api-python-client, google-auth-httplib2
 idna==2.8                 # via requests
 opencensus[stackdriver]==0.1.10
-protobuf==3.6.1           # via google-api-core, google-cloud-profiler, googleapis-common-protos, grpcio-health-checking
+protobuf==4.25.8           # via google-api-core, google-cloud-profiler, googleapis-common-protos, grpcio-health-checking
 pyasn1-modules==0.2.4     # via google-auth
 pyasn1==0.4.5             # via pyasn1-modules, rsa
 python-json-logger==0.1.9