diff --git a/requirements.txt b/requirements.txt
index 2b71aa9..f7e57cf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
 grpcio==1.18.0
-protobuf==3.15.0
+protobuf==3.18.3
diff --git a/setup.py b/setup.py
index 8fee721..49733c4 100644
--- a/setup.py
+++ b/setup.py
@@ -11,6 +11,6 @@
       packages=['iosxr_grpc'],
       install_requires=[
           'grpcio==1.18.0',
-          'protobuf==3.15.0',
+          'protobuf==3.18.3',
       ],
       zip_safe=False)