diff --git a/google/iam/v1/iam_policy_pb2.py b/google/iam/v1/iam_policy_pb2.py
index f92bc8e..2a05ba8 100644
--- a/google/iam/v1/iam_policy_pb2.py
+++ b/google/iam/v1/iam_policy_pb2.py
@@ -17,9 +17,10 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/v1/iam_policy.proto
 """Generated protocol buffer code."""
-from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
 
 # @@protoc_insertion_point(imports)
@@ -40,10 +41,60 @@
     b'\n\x1egoogle/iam/v1/iam_policy.proto\x12\rgoogle.iam.v1\x1a\x1cgoogle/api/annotations.proto\x1a\x17google/api/client.proto\x1a\x1fgoogle/api/field_behavior.proto\x1a\x19google/api/resource.proto\x1a\x1bgoogle/iam/v1/options.proto\x1a\x1agoogle/iam/v1/policy.proto\x1a google/protobuf/field_mask.proto"\x8f\x01\n\x13SetIamPolicyRequest\x12\x1b\n\x08resource\x18\x01 \x01(\tB\t\xe0\x41\x02\xfa\x41\x03\n\x01*\x12*\n\x06policy\x18\x02 \x01(\x0b\x32\x15.google.iam.v1.PolicyB\x03\xe0\x41\x02\x12/\n\x0bupdate_mask\x18\x03 \x01(\x0b\x32\x1a.google.protobuf.FieldMask"d\n\x13GetIamPolicyRequest\x12\x1b\n\x08resource\x18\x01 \x01(\tB\t\xe0\x41\x02\xfa\x41\x03\n\x01*\x12\x30\n\x07options\x18\x02 \x01(\x0b\x32\x1f.google.iam.v1.GetPolicyOptions"R\n\x19TestIamPermissionsRequest\x12\x1b\n\x08resource\x18\x01 \x01(\tB\t\xe0\x41\x02\xfa\x41\x03\n\x01*\x12\x18\n\x0bpermissions\x18\x02 \x03(\tB\x03\xe0\x41\x02"1\n\x1aTestIamPermissionsResponse\x12\x13\n\x0bpermissions\x18\x01 \x03(\t2\xb4\x03\n\tIAMPolicy\x12t\n\x0cSetIamPolicy\x12".google.iam.v1.SetIamPolicyRequest\x1a\x15.google.iam.v1.Policy")\x82\xd3\xe4\x93\x02#"\x1e/v1/{resource=**}:setIamPolicy:\x01*\x12t\n\x0cGetIamPolicy\x12".google.iam.v1.GetIamPolicyRequest\x1a\x15.google.iam.v1.Policy")\x82\xd3\xe4\x93\x02#"\x1e/v1/{resource=**}:getIamPolicy:\x01*\x12\x9a\x01\n\x12TestIamPermissions\x12(.google.iam.v1.TestIamPermissionsRequest\x1a).google.iam.v1.TestIamPermissionsResponse"/\x82\xd3\xe4\x93\x02)"$/v1/{resource=**}:testIamPermissions:\x01*\x1a\x1e\xca\x41\x1biam-meta-api.googleapis.comB\x86\x01\n\x11\x63om.google.iam.v1B\x0eIamPolicyProtoP\x01Z0google.golang.org/genproto/googleapis/iam/v1;iam\xf8\x01\x01\xaa\x02\x13Google.Cloud.Iam.V1\xca\x02\x13Google\\Cloud\\Iam\\V1b\x06proto3'
 )
 
-_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
-_builder.BuildTopDescriptorsAndMessages(
-    DESCRIPTOR, "google.iam.v1.iam_policy_pb2", globals()
+
+_SETIAMPOLICYREQUEST = DESCRIPTOR.message_types_by_name["SetIamPolicyRequest"]
+_GETIAMPOLICYREQUEST = DESCRIPTOR.message_types_by_name["GetIamPolicyRequest"]
+_TESTIAMPERMISSIONSREQUEST = DESCRIPTOR.message_types_by_name[
+    "TestIamPermissionsRequest"
+]
+_TESTIAMPERMISSIONSRESPONSE = DESCRIPTOR.message_types_by_name[
+    "TestIamPermissionsResponse"
+]
+SetIamPolicyRequest = _reflection.GeneratedProtocolMessageType(
+    "SetIamPolicyRequest",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _SETIAMPOLICYREQUEST,
+        "__module__": "google.iam.v1.iam_policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.SetIamPolicyRequest)
+    },
+)
+_sym_db.RegisterMessage(SetIamPolicyRequest)
+
+GetIamPolicyRequest = _reflection.GeneratedProtocolMessageType(
+    "GetIamPolicyRequest",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _GETIAMPOLICYREQUEST,
+        "__module__": "google.iam.v1.iam_policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.GetIamPolicyRequest)
+    },
+)
+_sym_db.RegisterMessage(GetIamPolicyRequest)
+
+TestIamPermissionsRequest = _reflection.GeneratedProtocolMessageType(
+    "TestIamPermissionsRequest",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _TESTIAMPERMISSIONSREQUEST,
+        "__module__": "google.iam.v1.iam_policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.TestIamPermissionsRequest)
+    },
+)
+_sym_db.RegisterMessage(TestIamPermissionsRequest)
+
+TestIamPermissionsResponse = _reflection.GeneratedProtocolMessageType(
+    "TestIamPermissionsResponse",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _TESTIAMPERMISSIONSRESPONSE,
+        "__module__": "google.iam.v1.iam_policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.TestIamPermissionsResponse)
+    },
 )
+_sym_db.RegisterMessage(TestIamPermissionsResponse)
+
+_IAMPOLICY = DESCRIPTOR.services_by_name["IAMPolicy"]
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None
diff --git a/google/iam/v1/logging/audit_data_pb2.py b/google/iam/v1/logging/audit_data_pb2.py
index d26da55..c7db9ae 100644
--- a/google/iam/v1/logging/audit_data_pb2.py
+++ b/google/iam/v1/logging/audit_data_pb2.py
@@ -17,9 +17,10 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/v1/logging/audit_data.proto
 """Generated protocol buffer code."""
-from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
 
 # @@protoc_insertion_point(imports)
@@ -34,10 +35,19 @@
     b'\n&google/iam/v1/logging/audit_data.proto\x12\x15google.iam.v1.logging\x1a\x1agoogle/iam/v1/policy.proto"=\n\tAuditData\x12\x30\n\x0cpolicy_delta\x18\x02 \x01(\x0b\x32\x1a.google.iam.v1.PolicyDeltaB\x89\x01\n\x19\x63om.google.iam.v1.loggingB\x0e\x41uditDataProtoP\x01Z<google.golang.org/genproto/googleapis/iam/v1/logging;logging\xaa\x02\x1bGoogle.Cloud.Iam.V1.Loggingb\x06proto3'
 )
 
-_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
-_builder.BuildTopDescriptorsAndMessages(
-    DESCRIPTOR, "google.iam.v1.logging.audit_data_pb2", globals()
+
+_AUDITDATA = DESCRIPTOR.message_types_by_name["AuditData"]
+AuditData = _reflection.GeneratedProtocolMessageType(
+    "AuditData",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _AUDITDATA,
+        "__module__": "google.iam.v1.logging.audit_data_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.logging.AuditData)
+    },
 )
+_sym_db.RegisterMessage(AuditData)
+
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None
diff --git a/google/iam/v1/options_pb2.py b/google/iam/v1/options_pb2.py
index 4374a5c..21ef36e 100644
--- a/google/iam/v1/options_pb2.py
+++ b/google/iam/v1/options_pb2.py
@@ -17,9 +17,10 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/v1/options.proto
 """Generated protocol buffer code."""
-from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
 
 # @@protoc_insertion_point(imports)
@@ -31,10 +32,19 @@
     b'\n\x1bgoogle/iam/v1/options.proto\x12\rgoogle.iam.v1"4\n\x10GetPolicyOptions\x12 \n\x18requested_policy_version\x18\x01 \x01(\x05\x42\x84\x01\n\x11\x63om.google.iam.v1B\x0cOptionsProtoP\x01Z0google.golang.org/genproto/googleapis/iam/v1;iam\xf8\x01\x01\xaa\x02\x13Google.Cloud.Iam.V1\xca\x02\x13Google\\Cloud\\Iam\\V1b\x06proto3'
 )
 
-_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
-_builder.BuildTopDescriptorsAndMessages(
-    DESCRIPTOR, "google.iam.v1.options_pb2", globals()
+
+_GETPOLICYOPTIONS = DESCRIPTOR.message_types_by_name["GetPolicyOptions"]
+GetPolicyOptions = _reflection.GeneratedProtocolMessageType(
+    "GetPolicyOptions",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _GETPOLICYOPTIONS,
+        "__module__": "google.iam.v1.options_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.GetPolicyOptions)
+    },
 )
+_sym_db.RegisterMessage(GetPolicyOptions)
+
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None
diff --git a/google/iam/v1/policy_pb2.py b/google/iam/v1/policy_pb2.py
index 10a2512..fd9a007 100644
--- a/google/iam/v1/policy_pb2.py
+++ b/google/iam/v1/policy_pb2.py
@@ -17,9 +17,10 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: google/iam/v1/policy.proto
 """Generated protocol buffer code."""
-from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import message as _message
+from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
 
 # @@protoc_insertion_point(imports)
@@ -34,10 +35,94 @@
     b'\n\x1agoogle/iam/v1/policy.proto\x12\rgoogle.iam.v1\x1a\x16google/type/expr.proto"\x84\x01\n\x06Policy\x12\x0f\n\x07version\x18\x01 \x01(\x05\x12(\n\x08\x62indings\x18\x04 \x03(\x0b\x32\x16.google.iam.v1.Binding\x12\x31\n\raudit_configs\x18\x06 \x03(\x0b\x32\x1a.google.iam.v1.AuditConfig\x12\x0c\n\x04\x65tag\x18\x03 \x01(\x0c"N\n\x07\x42inding\x12\x0c\n\x04role\x18\x01 \x01(\t\x12\x0f\n\x07members\x18\x02 \x03(\t\x12$\n\tcondition\x18\x03 \x01(\x0b\x32\x11.google.type.Expr"X\n\x0b\x41uditConfig\x12\x0f\n\x07service\x18\x01 \x01(\t\x12\x38\n\x11\x61udit_log_configs\x18\x03 \x03(\x0b\x32\x1d.google.iam.v1.AuditLogConfig"\xb7\x01\n\x0e\x41uditLogConfig\x12\x37\n\x08log_type\x18\x01 \x01(\x0e\x32%.google.iam.v1.AuditLogConfig.LogType\x12\x18\n\x10\x65xempted_members\x18\x02 \x03(\t"R\n\x07LogType\x12\x18\n\x14LOG_TYPE_UNSPECIFIED\x10\x00\x12\x0e\n\nADMIN_READ\x10\x01\x12\x0e\n\nDATA_WRITE\x10\x02\x12\r\n\tDATA_READ\x10\x03"\x80\x01\n\x0bPolicyDelta\x12\x33\n\x0e\x62inding_deltas\x18\x01 \x03(\x0b\x32\x1b.google.iam.v1.BindingDelta\x12<\n\x13\x61udit_config_deltas\x18\x02 \x03(\x0b\x32\x1f.google.iam.v1.AuditConfigDelta"\xbd\x01\n\x0c\x42indingDelta\x12\x32\n\x06\x61\x63tion\x18\x01 \x01(\x0e\x32".google.iam.v1.BindingDelta.Action\x12\x0c\n\x04role\x18\x02 \x01(\t\x12\x0e\n\x06member\x18\x03 \x01(\t\x12$\n\tcondition\x18\x04 \x01(\x0b\x32\x11.google.type.Expr"5\n\x06\x41\x63tion\x12\x16\n\x12\x41\x43TION_UNSPECIFIED\x10\x00\x12\x07\n\x03\x41\x44\x44\x10\x01\x12\n\n\x06REMOVE\x10\x02"\xbd\x01\n\x10\x41uditConfigDelta\x12\x36\n\x06\x61\x63tion\x18\x01 \x01(\x0e\x32&.google.iam.v1.AuditConfigDelta.Action\x12\x0f\n\x07service\x18\x02 \x01(\t\x12\x17\n\x0f\x65xempted_member\x18\x03 \x01(\t\x12\x10\n\x08log_type\x18\x04 \x01(\t"5\n\x06\x41\x63tion\x12\x16\n\x12\x41\x43TION_UNSPECIFIED\x10\x00\x12\x07\n\x03\x41\x44\x44\x10\x01\x12\n\n\x06REMOVE\x10\x02\x42\x83\x01\n\x11\x63om.google.iam.v1B\x0bPolicyProtoP\x01Z0google.golang.org/genproto/googleapis/iam/v1;iam\xf8\x01\x01\xaa\x02\x13Google.Cloud.Iam.V1\xca\x02\x13Google\\Cloud\\Iam\\V1b\x06proto3'
 )
 
-_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
-_builder.BuildTopDescriptorsAndMessages(
-    DESCRIPTOR, "google.iam.v1.policy_pb2", globals()
+
+_POLICY = DESCRIPTOR.message_types_by_name["Policy"]
+_BINDING = DESCRIPTOR.message_types_by_name["Binding"]
+_AUDITCONFIG = DESCRIPTOR.message_types_by_name["AuditConfig"]
+_AUDITLOGCONFIG = DESCRIPTOR.message_types_by_name["AuditLogConfig"]
+_POLICYDELTA = DESCRIPTOR.message_types_by_name["PolicyDelta"]
+_BINDINGDELTA = DESCRIPTOR.message_types_by_name["BindingDelta"]
+_AUDITCONFIGDELTA = DESCRIPTOR.message_types_by_name["AuditConfigDelta"]
+_AUDITLOGCONFIG_LOGTYPE = _AUDITLOGCONFIG.enum_types_by_name["LogType"]
+_BINDINGDELTA_ACTION = _BINDINGDELTA.enum_types_by_name["Action"]
+_AUDITCONFIGDELTA_ACTION = _AUDITCONFIGDELTA.enum_types_by_name["Action"]
+Policy = _reflection.GeneratedProtocolMessageType(
+    "Policy",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _POLICY,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.Policy)
+    },
+)
+_sym_db.RegisterMessage(Policy)
+
+Binding = _reflection.GeneratedProtocolMessageType(
+    "Binding",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _BINDING,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.Binding)
+    },
+)
+_sym_db.RegisterMessage(Binding)
+
+AuditConfig = _reflection.GeneratedProtocolMessageType(
+    "AuditConfig",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _AUDITCONFIG,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.AuditConfig)
+    },
+)
+_sym_db.RegisterMessage(AuditConfig)
+
+AuditLogConfig = _reflection.GeneratedProtocolMessageType(
+    "AuditLogConfig",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _AUDITLOGCONFIG,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.AuditLogConfig)
+    },
 )
+_sym_db.RegisterMessage(AuditLogConfig)
+
+PolicyDelta = _reflection.GeneratedProtocolMessageType(
+    "PolicyDelta",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _POLICYDELTA,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.PolicyDelta)
+    },
+)
+_sym_db.RegisterMessage(PolicyDelta)
+
+BindingDelta = _reflection.GeneratedProtocolMessageType(
+    "BindingDelta",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _BINDINGDELTA,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.BindingDelta)
+    },
+)
+_sym_db.RegisterMessage(BindingDelta)
+
+AuditConfigDelta = _reflection.GeneratedProtocolMessageType(
+    "AuditConfigDelta",
+    (_message.Message,),
+    {
+        "DESCRIPTOR": _AUDITCONFIGDELTA,
+        "__module__": "google.iam.v1.policy_pb2"
+        # @@protoc_insertion_point(class_scope:google.iam.v1.AuditConfigDelta)
+    },
+)
+_sym_db.RegisterMessage(AuditConfigDelta)
+
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None
diff --git a/noxfile.py b/noxfile.py
index 5cee3fe..89cc8f9 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -20,6 +20,11 @@
 
 BLACK_VERSION = "black==22.3.0"
 
+# NOTE: Pin the version of grpcio-tools to 1.48.2 for compatibility with
+# Protobuf 3.19.5. Please ensure that the minimum required version of
+# protobuf in setup.py is compatible with the pb2 files generated
+# by grpcio-tools before changing the pinned version below.
+GRPCIO_TOOLS_VERSION = "grpcio-tools==1.48.2"
 
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
@@ -206,7 +211,7 @@ def generate_protos(session):
        files.
     """
 
-    session.install("grpcio-tools")
+    session.install(GRPCIO_TOOLS_VERSION)
     protos = [str(p) for p in (Path(".").glob("google/**/*.proto"))]
     session.run(
         "python", "-m", "grpc_tools.protoc", "--proto_path=.", "--python_out=.", *protos
diff --git a/setup.py b/setup.py
index 2d6b94b..3474767 100644
--- a/setup.py
+++ b/setup.py
@@ -28,7 +28,7 @@
 dependencies = [
     "grpcio>=1.44.0, <2.0.0dev",
     "googleapis-common-protos[grpc]>=1.56.0, <2.0.0dev",
-    "protobuf >= 3.20.2, <5.0.0dev",
+    "protobuf>=3.19.5,<5.0.0dev,!=3.20.0,!=3.20.1,!=4.21.1,!=4.21.2,!=4.21.3,!=4.21.4,!=4.21.5",
 ]
 
 package_root = os.path.abspath(os.path.dirname(__file__))