diff --git a/pylibs/unittests/requirements.txt b/pylibs/unittests/requirements.txt
index 0e53a881..ec33383a 100644
--- a/pylibs/unittests/requirements.txt
+++ b/pylibs/unittests/requirements.txt
@@ -1,4 +1,4 @@
 grpcio-tools==1.46.3
 grpcio==1.46.3
-protobuf==3.15.0
+protobuf==3.18.3
 wheel==0.38.1