diff --git a/googleapis/datastore/v1/datastore.pb.go b/googleapis/datastore/v1/datastore.pb.go
index 36bed5a8b..8381c9695 100644
--- a/googleapis/datastore/v1/datastore.pb.go
+++ b/googleapis/datastore/v1/datastore.pb.go
@@ -146,7 +146,7 @@ func (x ReadOptions_ReadConsistency) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use ReadOptions_ReadConsistency.Descriptor instead.
 func (ReadOptions_ReadConsistency) EnumDescriptor() ([]byte, []int) {
-	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{18, 0}
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{19, 0}
 }
 
 // The request for [Datastore.Lookup][google.datastore.v1.Datastore.Lookup].
@@ -166,6 +166,13 @@ type LookupRequest struct {
 	ReadOptions *ReadOptions `protobuf:"bytes,1,opt,name=read_options,json=readOptions,proto3" json:"read_options,omitempty"`
 	// Required. Keys of entities to look up.
 	Keys []*Key `protobuf:"bytes,3,rep,name=keys,proto3" json:"keys,omitempty"`
+	// The properties to return. Defaults to returning all properties.
+	//
+	// If this field is set and an entity has a property not referenced in the
+	// mask, it will be absent from [LookupResponse.found.entity.properties][].
+	//
+	// The entity's key is always returned.
+	PropertyMask *PropertyMask `protobuf:"bytes,5,opt,name=property_mask,json=propertyMask,proto3" json:"property_mask,omitempty"`
 }
 
 func (x *LookupRequest) Reset() {
@@ -228,6 +235,13 @@ func (x *LookupRequest) GetKeys() []*Key {
 	return nil
 }
 
+func (x *LookupRequest) GetPropertyMask() *PropertyMask {
+	if x != nil {
+		return x.PropertyMask
+	}
+	return nil
+}
+
 // The response for [Datastore.Lookup][google.datastore.v1.Datastore.Lookup].
 type LookupResponse struct {
 	state         protoimpl.MessageState
@@ -352,6 +366,12 @@ type RunQueryRequest struct {
 	//	*RunQueryRequest_Query
 	//	*RunQueryRequest_GqlQuery
 	QueryType isRunQueryRequest_QueryType `protobuf_oneof:"query_type"`
+	// The properties to return.
+	// This field must not be set for a projection query.
+	//
+	// See
+	// [LookupRequest.property_mask][google.datastore.v1.LookupRequest.property_mask].
+	PropertyMask *PropertyMask `protobuf:"bytes,10,opt,name=property_mask,json=propertyMask,proto3" json:"property_mask,omitempty"`
 	// Optional. Explain options for the query. If set, additional query
 	// statistics will be returned. If not, only query results will be returned.
 	ExplainOptions *ExplainOptions `protobuf:"bytes,12,opt,name=explain_options,json=explainOptions,proto3" json:"explain_options,omitempty"`
@@ -438,6 +458,13 @@ func (x *RunQueryRequest) GetGqlQuery() *GqlQuery {
 	return nil
 }
 
+func (x *RunQueryRequest) GetPropertyMask() *PropertyMask {
+	if x != nil {
+		return x.PropertyMask
+	}
+	return nil
+}
+
 func (x *RunQueryRequest) GetExplainOptions() *ExplainOptions {
 	if x != nil {
 		return x.ExplainOptions
@@ -1482,6 +1509,15 @@ type Mutation struct {
 	//	*Mutation_BaseVersion
 	//	*Mutation_UpdateTime
 	ConflictDetectionStrategy isMutation_ConflictDetectionStrategy `protobuf_oneof:"conflict_detection_strategy"`
+	// The properties to write in this mutation.
+	// None of the properties in the mask may have a reserved name, except for
+	// `__key__`.
+	// This field is ignored for `delete`.
+	//
+	// If the entity already exists, only properties referenced in the mask are
+	// updated, others are left untouched.
+	// Properties referenced in the mask but not in the entity are deleted.
+	PropertyMask *PropertyMask `protobuf:"bytes,9,opt,name=property_mask,json=propertyMask,proto3" json:"property_mask,omitempty"`
 }
 
 func (x *Mutation) Reset() {
@@ -1572,6 +1608,13 @@ func (x *Mutation) GetUpdateTime() *timestamppb.Timestamp {
 	return nil
 }
 
+func (x *Mutation) GetPropertyMask() *PropertyMask {
+	if x != nil {
+		return x.PropertyMask
+	}
+	return nil
+}
+
 type isMutation_Operation interface {
 	isMutation_Operation()
 }
@@ -1724,6 +1767,66 @@ func (x *MutationResult) GetConflictDetected() bool {
 	return false
 }
 
+// The set of arbitrarily nested property paths used to restrict an operation to
+// only a subset of properties in an entity.
+type PropertyMask struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The paths to the properties covered by this mask.
+	//
+	// A path is a list of property names separated by dots (`.`), for example
+	// `foo.bar` means the property `bar` inside the entity property `foo` inside
+	// the entity associated with this path.
+	//
+	// If a property name contains a dot `.` or a backslash `\`, then that
+	// name must be escaped.
+	//
+	// A path must not be empty, and may not reference a value inside an
+	// [array value][google.datastore.v1.Value.array_value].
+	Paths []string `protobuf:"bytes,1,rep,name=paths,proto3" json:"paths,omitempty"`
+}
+
+func (x *PropertyMask) Reset() {
+	*x = PropertyMask{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_google_datastore_v1_datastore_proto_msgTypes[18]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PropertyMask) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PropertyMask) ProtoMessage() {}
+
+func (x *PropertyMask) ProtoReflect() protoreflect.Message {
+	mi := &file_google_datastore_v1_datastore_proto_msgTypes[18]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PropertyMask.ProtoReflect.Descriptor instead.
+func (*PropertyMask) Descriptor() ([]byte, []int) {
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{18}
+}
+
+func (x *PropertyMask) GetPaths() []string {
+	if x != nil {
+		return x.Paths
+	}
+	return nil
+}
+
 // The options shared by read requests.
 type ReadOptions struct {
 	state         protoimpl.MessageState
@@ -1753,7 +1856,7 @@ type ReadOptions struct {
 func (x *ReadOptions) Reset() {
 	*x = ReadOptions{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_datastore_v1_datastore_proto_msgTypes[18]
+		mi := &file_google_datastore_v1_datastore_proto_msgTypes[19]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1766,7 +1869,7 @@ func (x *ReadOptions) String() string {
 func (*ReadOptions) ProtoMessage() {}
 
 func (x *ReadOptions) ProtoReflect() protoreflect.Message {
-	mi := &file_google_datastore_v1_datastore_proto_msgTypes[18]
+	mi := &file_google_datastore_v1_datastore_proto_msgTypes[19]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1779,7 +1882,7 @@ func (x *ReadOptions) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ReadOptions.ProtoReflect.Descriptor instead.
 func (*ReadOptions) Descriptor() ([]byte, []int) {
-	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{18}
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{19}
 }
 
 func (m *ReadOptions) GetConsistencyType() isReadOptions_ConsistencyType {
@@ -1887,7 +1990,7 @@ type TransactionOptions struct {
 func (x *TransactionOptions) Reset() {
 	*x = TransactionOptions{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_datastore_v1_datastore_proto_msgTypes[19]
+		mi := &file_google_datastore_v1_datastore_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1900,7 +2003,7 @@ func (x *TransactionOptions) String() string {
 func (*TransactionOptions) ProtoMessage() {}
 
 func (x *TransactionOptions) ProtoReflect() protoreflect.Message {
-	mi := &file_google_datastore_v1_datastore_proto_msgTypes[19]
+	mi := &file_google_datastore_v1_datastore_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1913,7 +2016,7 @@ func (x *TransactionOptions) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TransactionOptions.ProtoReflect.Descriptor instead.
 func (*TransactionOptions) Descriptor() ([]byte, []int) {
-	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{19}
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{20}
 }
 
 func (m *TransactionOptions) GetMode() isTransactionOptions_Mode {
@@ -1968,7 +2071,7 @@ type TransactionOptions_ReadWrite struct {
 func (x *TransactionOptions_ReadWrite) Reset() {
 	*x = TransactionOptions_ReadWrite{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_datastore_v1_datastore_proto_msgTypes[20]
+		mi := &file_google_datastore_v1_datastore_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1981,7 +2084,7 @@ func (x *TransactionOptions_ReadWrite) String() string {
 func (*TransactionOptions_ReadWrite) ProtoMessage() {}
 
 func (x *TransactionOptions_ReadWrite) ProtoReflect() protoreflect.Message {
-	mi := &file_google_datastore_v1_datastore_proto_msgTypes[20]
+	mi := &file_google_datastore_v1_datastore_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1994,7 +2097,7 @@ func (x *TransactionOptions_ReadWrite) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TransactionOptions_ReadWrite.ProtoReflect.Descriptor instead.
 func (*TransactionOptions_ReadWrite) Descriptor() ([]byte, []int) {
-	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{19, 0}
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{20, 0}
 }
 
 func (x *TransactionOptions_ReadWrite) GetPreviousTransaction() []byte {
@@ -2021,7 +2124,7 @@ type TransactionOptions_ReadOnly struct {
 func (x *TransactionOptions_ReadOnly) Reset() {
 	*x = TransactionOptions_ReadOnly{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_datastore_v1_datastore_proto_msgTypes[21]
+		mi := &file_google_datastore_v1_datastore_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2034,7 +2137,7 @@ func (x *TransactionOptions_ReadOnly) String() string {
 func (*TransactionOptions_ReadOnly) ProtoMessage() {}
 
 func (x *TransactionOptions_ReadOnly) ProtoReflect() protoreflect.Message {
-	mi := &file_google_datastore_v1_datastore_proto_msgTypes[21]
+	mi := &file_google_datastore_v1_datastore_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2047,7 +2150,7 @@ func (x *TransactionOptions_ReadOnly) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use TransactionOptions_ReadOnly.ProtoReflect.Descriptor instead.
 func (*TransactionOptions_ReadOnly) Descriptor() ([]byte, []int) {
-	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{19, 1}
+	return file_google_datastore_v1_datastore_proto_rawDescGZIP(), []int{20, 1}
 }
 
 func (x *TransactionOptions_ReadOnly) GetReadTime() *timestamppb.Timestamp {
@@ -2082,7 +2185,7 @@ var file_google_datastore_v1_datastore_proto_rawDesc = []byte{
 	0x76, 0x31, 0x2f, 0x71, 0x75, 0x65, 0x72, 0x79, 0x5f, 0x70, 0x72, 0x6f, 0x66, 0x69, 0x6c, 0x65,
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@@ -2095,46 +2198,55 @@ var file_google_datastore_v1_datastore_proto_rawDesc = []byte{
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 }
 
 var (
@@ -2513,7 +2632,7 @@ func file_google_datastore_v1_datastore_proto_rawDescGZIP() []byte {
 }
 
 var file_google_datastore_v1_datastore_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_google_datastore_v1_datastore_proto_msgTypes = make([]protoimpl.MessageInfo, 22)
+var file_google_datastore_v1_datastore_proto_msgTypes = make([]protoimpl.MessageInfo, 23)
 var file_google_datastore_v1_datastore_proto_goTypes = []interface{}{
 	(CommitRequest_Mode)(0),              // 0: google.datastore.v1.CommitRequest.Mode
 	(ReadOptions_ReadConsistency)(0),     // 1: google.datastore.v1.ReadOptions.ReadConsistency
@@ -2535,90 +2654,94 @@ var file_google_datastore_v1_datastore_proto_goTypes = []interface{}{
 	(*ReserveIdsResponse)(nil),           // 17: google.datastore.v1.ReserveIdsResponse
 	(*Mutation)(nil),                     // 18: google.datastore.v1.Mutation
 	(*MutationResult)(nil),               // 19: google.datastore.v1.MutationResult
-	(*ReadOptions)(nil),                  // 20: google.datastore.v1.ReadOptions
-	(*TransactionOptions)(nil),           // 21: google.datastore.v1.TransactionOptions
-	(*TransactionOptions_ReadWrite)(nil), // 22: google.datastore.v1.TransactionOptions.ReadWrite
-	(*TransactionOptions_ReadOnly)(nil),  // 23: google.datastore.v1.TransactionOptions.ReadOnly
-	(*Key)(nil),                          // 24: google.datastore.v1.Key
-	(*EntityResult)(nil),                 // 25: google.datastore.v1.EntityResult
-	(*timestamppb.Timestamp)(nil),        // 26: google.protobuf.Timestamp
-	(*PartitionId)(nil),                  // 27: google.datastore.v1.PartitionId
-	(*Query)(nil),                        // 28: google.datastore.v1.Query
-	(*GqlQuery)(nil),                     // 29: google.datastore.v1.GqlQuery
-	(*ExplainOptions)(nil),               // 30: google.datastore.v1.ExplainOptions
-	(*QueryResultBatch)(nil),             // 31: google.datastore.v1.QueryResultBatch
-	(*ExplainMetrics)(nil),               // 32: google.datastore.v1.ExplainMetrics
-	(*AggregationQuery)(nil),             // 33: google.datastore.v1.AggregationQuery
-	(*AggregationResultBatch)(nil),       // 34: google.datastore.v1.AggregationResultBatch
-	(*Entity)(nil),                       // 35: google.datastore.v1.Entity
+	(*PropertyMask)(nil),                 // 20: google.datastore.v1.PropertyMask
+	(*ReadOptions)(nil),                  // 21: google.datastore.v1.ReadOptions
+	(*TransactionOptions)(nil),           // 22: google.datastore.v1.TransactionOptions
+	(*TransactionOptions_ReadWrite)(nil), // 23: google.datastore.v1.TransactionOptions.ReadWrite
+	(*TransactionOptions_ReadOnly)(nil),  // 24: google.datastore.v1.TransactionOptions.ReadOnly
+	(*Key)(nil),                          // 25: google.datastore.v1.Key
+	(*EntityResult)(nil),                 // 26: google.datastore.v1.EntityResult
+	(*timestamppb.Timestamp)(nil),        // 27: google.protobuf.Timestamp
+	(*PartitionId)(nil),                  // 28: google.datastore.v1.PartitionId
+	(*Query)(nil),                        // 29: google.datastore.v1.Query
+	(*GqlQuery)(nil),                     // 30: google.datastore.v1.GqlQuery
+	(*ExplainOptions)(nil),               // 31: google.datastore.v1.ExplainOptions
+	(*QueryResultBatch)(nil),             // 32: google.datastore.v1.QueryResultBatch
+	(*ExplainMetrics)(nil),               // 33: google.datastore.v1.ExplainMetrics
+	(*AggregationQuery)(nil),             // 34: google.datastore.v1.AggregationQuery
+	(*AggregationResultBatch)(nil),       // 35: google.datastore.v1.AggregationResultBatch
+	(*Entity)(nil),                       // 36: google.datastore.v1.Entity
 }
 var file_google_datastore_v1_datastore_proto_depIdxs = []int32{
-	20, // 0: google.datastore.v1.LookupRequest.read_options:type_name -> google.datastore.v1.ReadOptions
-	24, // 1: google.datastore.v1.LookupRequest.keys:type_name -> google.datastore.v1.Key
-	25, // 2: google.datastore.v1.LookupResponse.found:type_name -> google.datastore.v1.EntityResult
-	25, // 3: google.datastore.v1.LookupResponse.missing:type_name -> google.datastore.v1.EntityResult
-	24, // 4: google.datastore.v1.LookupResponse.deferred:type_name -> google.datastore.v1.Key
-	26, // 5: google.datastore.v1.LookupResponse.read_time:type_name -> google.protobuf.Timestamp
-	27, // 6: google.datastore.v1.RunQueryRequest.partition_id:type_name -> google.datastore.v1.PartitionId
-	20, // 7: google.datastore.v1.RunQueryRequest.read_options:type_name -> google.datastore.v1.ReadOptions
-	28, // 8: google.datastore.v1.RunQueryRequest.query:type_name -> google.datastore.v1.Query
-	29, // 9: google.datastore.v1.RunQueryRequest.gql_query:type_name -> google.datastore.v1.GqlQuery
-	30, // 10: google.datastore.v1.RunQueryRequest.explain_options:type_name -> google.datastore.v1.ExplainOptions
-	31, // 11: google.datastore.v1.RunQueryResponse.batch:type_name -> google.datastore.v1.QueryResultBatch
-	28, // 12: google.datastore.v1.RunQueryResponse.query:type_name -> google.datastore.v1.Query
-	32, // 13: google.datastore.v1.RunQueryResponse.explain_metrics:type_name -> google.datastore.v1.ExplainMetrics
-	27, // 14: google.datastore.v1.RunAggregationQueryRequest.partition_id:type_name -> google.datastore.v1.PartitionId
-	20, // 15: google.datastore.v1.RunAggregationQueryRequest.read_options:type_name -> google.datastore.v1.ReadOptions
-	33, // 16: google.datastore.v1.RunAggregationQueryRequest.aggregation_query:type_name -> google.datastore.v1.AggregationQuery
-	29, // 17: google.datastore.v1.RunAggregationQueryRequest.gql_query:type_name -> google.datastore.v1.GqlQuery
-	30, // 18: google.datastore.v1.RunAggregationQueryRequest.explain_options:type_name -> google.datastore.v1.ExplainOptions
-	34, // 19: google.datastore.v1.RunAggregationQueryResponse.batch:type_name -> google.datastore.v1.AggregationResultBatch
-	33, // 20: google.datastore.v1.RunAggregationQueryResponse.query:type_name -> google.datastore.v1.AggregationQuery
-	32, // 21: google.datastore.v1.RunAggregationQueryResponse.explain_metrics:type_name -> google.datastore.v1.ExplainMetrics
-	21, // 22: google.datastore.v1.BeginTransactionRequest.transaction_options:type_name -> google.datastore.v1.TransactionOptions
-	0,  // 23: google.datastore.v1.CommitRequest.mode:type_name -> google.datastore.v1.CommitRequest.Mode
-	21, // 24: google.datastore.v1.CommitRequest.single_use_transaction:type_name -> google.datastore.v1.TransactionOptions
-	18, // 25: google.datastore.v1.CommitRequest.mutations:type_name -> google.datastore.v1.Mutation
-	19, // 26: google.datastore.v1.CommitResponse.mutation_results:type_name -> google.datastore.v1.MutationResult
-	26, // 27: google.datastore.v1.CommitResponse.commit_time:type_name -> google.protobuf.Timestamp
-	24, // 28: google.datastore.v1.AllocateIdsRequest.keys:type_name -> google.datastore.v1.Key
-	24, // 29: google.datastore.v1.AllocateIdsResponse.keys:type_name -> google.datastore.v1.Key
-	24, // 30: google.datastore.v1.ReserveIdsRequest.keys:type_name -> google.datastore.v1.Key
-	35, // 31: google.datastore.v1.Mutation.insert:type_name -> google.datastore.v1.Entity
-	35, // 32: google.datastore.v1.Mutation.update:type_name -> google.datastore.v1.Entity
-	35, // 33: google.datastore.v1.Mutation.upsert:type_name -> google.datastore.v1.Entity
-	24, // 34: google.datastore.v1.Mutation.delete:type_name -> google.datastore.v1.Key
-	26, // 35: google.datastore.v1.Mutation.update_time:type_name -> google.protobuf.Timestamp
-	24, // 36: google.datastore.v1.MutationResult.key:type_name -> google.datastore.v1.Key
-	26, // 37: google.datastore.v1.MutationResult.create_time:type_name -> google.protobuf.Timestamp
-	26, // 38: google.datastore.v1.MutationResult.update_time:type_name -> google.protobuf.Timestamp
-	1,  // 39: google.datastore.v1.ReadOptions.read_consistency:type_name -> google.datastore.v1.ReadOptions.ReadConsistency
-	21, // 40: google.datastore.v1.ReadOptions.new_transaction:type_name -> google.datastore.v1.TransactionOptions
-	26, // 41: google.datastore.v1.ReadOptions.read_time:type_name -> google.protobuf.Timestamp
-	22, // 42: google.datastore.v1.TransactionOptions.read_write:type_name -> google.datastore.v1.TransactionOptions.ReadWrite
-	23, // 43: google.datastore.v1.TransactionOptions.read_only:type_name -> google.datastore.v1.TransactionOptions.ReadOnly
-	26, // 44: google.datastore.v1.TransactionOptions.ReadOnly.read_time:type_name -> google.protobuf.Timestamp
-	2,  // 45: google.datastore.v1.Datastore.Lookup:input_type -> google.datastore.v1.LookupRequest
-	4,  // 46: google.datastore.v1.Datastore.RunQuery:input_type -> google.datastore.v1.RunQueryRequest
-	6,  // 47: google.datastore.v1.Datastore.RunAggregationQuery:input_type -> google.datastore.v1.RunAggregationQueryRequest
-	8,  // 48: google.datastore.v1.Datastore.BeginTransaction:input_type -> google.datastore.v1.BeginTransactionRequest
-	12, // 49: google.datastore.v1.Datastore.Commit:input_type -> google.datastore.v1.CommitRequest
-	10, // 50: google.datastore.v1.Datastore.Rollback:input_type -> google.datastore.v1.RollbackRequest
-	14, // 51: google.datastore.v1.Datastore.AllocateIds:input_type -> google.datastore.v1.AllocateIdsRequest
-	16, // 52: google.datastore.v1.Datastore.ReserveIds:input_type -> google.datastore.v1.ReserveIdsRequest
-	3,  // 53: google.datastore.v1.Datastore.Lookup:output_type -> google.datastore.v1.LookupResponse
-	5,  // 54: google.datastore.v1.Datastore.RunQuery:output_type -> google.datastore.v1.RunQueryResponse
-	7,  // 55: google.datastore.v1.Datastore.RunAggregationQuery:output_type -> google.datastore.v1.RunAggregationQueryResponse
-	9,  // 56: google.datastore.v1.Datastore.BeginTransaction:output_type -> google.datastore.v1.BeginTransactionResponse
-	13, // 57: google.datastore.v1.Datastore.Commit:output_type -> google.datastore.v1.CommitResponse
-	11, // 58: google.datastore.v1.Datastore.Rollback:output_type -> google.datastore.v1.RollbackResponse
-	15, // 59: google.datastore.v1.Datastore.AllocateIds:output_type -> google.datastore.v1.AllocateIdsResponse
-	17, // 60: google.datastore.v1.Datastore.ReserveIds:output_type -> google.datastore.v1.ReserveIdsResponse
-	53, // [53:61] is the sub-list for method output_type
-	45, // [45:53] is the sub-list for method input_type
-	45, // [45:45] is the sub-list for extension type_name
-	45, // [45:45] is the sub-list for extension extendee
-	0,  // [0:45] is the sub-list for field type_name
+	21, // 0: google.datastore.v1.LookupRequest.read_options:type_name -> google.datastore.v1.ReadOptions
+	25, // 1: google.datastore.v1.LookupRequest.keys:type_name -> google.datastore.v1.Key
+	20, // 2: google.datastore.v1.LookupRequest.property_mask:type_name -> google.datastore.v1.PropertyMask
+	26, // 3: google.datastore.v1.LookupResponse.found:type_name -> google.datastore.v1.EntityResult
+	26, // 4: google.datastore.v1.LookupResponse.missing:type_name -> google.datastore.v1.EntityResult
+	25, // 5: google.datastore.v1.LookupResponse.deferred:type_name -> google.datastore.v1.Key
+	27, // 6: google.datastore.v1.LookupResponse.read_time:type_name -> google.protobuf.Timestamp
+	28, // 7: google.datastore.v1.RunQueryRequest.partition_id:type_name -> google.datastore.v1.PartitionId
+	21, // 8: google.datastore.v1.RunQueryRequest.read_options:type_name -> google.datastore.v1.ReadOptions
+	29, // 9: google.datastore.v1.RunQueryRequest.query:type_name -> google.datastore.v1.Query
+	30, // 10: google.datastore.v1.RunQueryRequest.gql_query:type_name -> google.datastore.v1.GqlQuery
+	20, // 11: google.datastore.v1.RunQueryRequest.property_mask:type_name -> google.datastore.v1.PropertyMask
+	31, // 12: google.datastore.v1.RunQueryRequest.explain_options:type_name -> google.datastore.v1.ExplainOptions
+	32, // 13: google.datastore.v1.RunQueryResponse.batch:type_name -> google.datastore.v1.QueryResultBatch
+	29, // 14: google.datastore.v1.RunQueryResponse.query:type_name -> google.datastore.v1.Query
+	33, // 15: google.datastore.v1.RunQueryResponse.explain_metrics:type_name -> google.datastore.v1.ExplainMetrics
+	28, // 16: google.datastore.v1.RunAggregationQueryRequest.partition_id:type_name -> google.datastore.v1.PartitionId
+	21, // 17: google.datastore.v1.RunAggregationQueryRequest.read_options:type_name -> google.datastore.v1.ReadOptions
+	34, // 18: google.datastore.v1.RunAggregationQueryRequest.aggregation_query:type_name -> google.datastore.v1.AggregationQuery
+	30, // 19: google.datastore.v1.RunAggregationQueryRequest.gql_query:type_name -> google.datastore.v1.GqlQuery
+	31, // 20: google.datastore.v1.RunAggregationQueryRequest.explain_options:type_name -> google.datastore.v1.ExplainOptions
+	35, // 21: google.datastore.v1.RunAggregationQueryResponse.batch:type_name -> google.datastore.v1.AggregationResultBatch
+	34, // 22: google.datastore.v1.RunAggregationQueryResponse.query:type_name -> google.datastore.v1.AggregationQuery
+	33, // 23: google.datastore.v1.RunAggregationQueryResponse.explain_metrics:type_name -> google.datastore.v1.ExplainMetrics
+	22, // 24: google.datastore.v1.BeginTransactionRequest.transaction_options:type_name -> google.datastore.v1.TransactionOptions
+	0,  // 25: google.datastore.v1.CommitRequest.mode:type_name -> google.datastore.v1.CommitRequest.Mode
+	22, // 26: google.datastore.v1.CommitRequest.single_use_transaction:type_name -> google.datastore.v1.TransactionOptions
+	18, // 27: google.datastore.v1.CommitRequest.mutations:type_name -> google.datastore.v1.Mutation
+	19, // 28: google.datastore.v1.CommitResponse.mutation_results:type_name -> google.datastore.v1.MutationResult
+	27, // 29: google.datastore.v1.CommitResponse.commit_time:type_name -> google.protobuf.Timestamp
+	25, // 30: google.datastore.v1.AllocateIdsRequest.keys:type_name -> google.datastore.v1.Key
+	25, // 31: google.datastore.v1.AllocateIdsResponse.keys:type_name -> google.datastore.v1.Key
+	25, // 32: google.datastore.v1.ReserveIdsRequest.keys:type_name -> google.datastore.v1.Key
+	36, // 33: google.datastore.v1.Mutation.insert:type_name -> google.datastore.v1.Entity
+	36, // 34: google.datastore.v1.Mutation.update:type_name -> google.datastore.v1.Entity
+	36, // 35: google.datastore.v1.Mutation.upsert:type_name -> google.datastore.v1.Entity
+	25, // 36: google.datastore.v1.Mutation.delete:type_name -> google.datastore.v1.Key
+	27, // 37: google.datastore.v1.Mutation.update_time:type_name -> google.protobuf.Timestamp
+	20, // 38: google.datastore.v1.Mutation.property_mask:type_name -> google.datastore.v1.PropertyMask
+	25, // 39: google.datastore.v1.MutationResult.key:type_name -> google.datastore.v1.Key
+	27, // 40: google.datastore.v1.MutationResult.create_time:type_name -> google.protobuf.Timestamp
+	27, // 41: google.datastore.v1.MutationResult.update_time:type_name -> google.protobuf.Timestamp
+	1,  // 42: google.datastore.v1.ReadOptions.read_consistency:type_name -> google.datastore.v1.ReadOptions.ReadConsistency
+	22, // 43: google.datastore.v1.ReadOptions.new_transaction:type_name -> google.datastore.v1.TransactionOptions
+	27, // 44: google.datastore.v1.ReadOptions.read_time:type_name -> google.protobuf.Timestamp
+	23, // 45: google.datastore.v1.TransactionOptions.read_write:type_name -> google.datastore.v1.TransactionOptions.ReadWrite
+	24, // 46: google.datastore.v1.TransactionOptions.read_only:type_name -> google.datastore.v1.TransactionOptions.ReadOnly
+	27, // 47: google.datastore.v1.TransactionOptions.ReadOnly.read_time:type_name -> google.protobuf.Timestamp
+	2,  // 48: google.datastore.v1.Datastore.Lookup:input_type -> google.datastore.v1.LookupRequest
+	4,  // 49: google.datastore.v1.Datastore.RunQuery:input_type -> google.datastore.v1.RunQueryRequest
+	6,  // 50: google.datastore.v1.Datastore.RunAggregationQuery:input_type -> google.datastore.v1.RunAggregationQueryRequest
+	8,  // 51: google.datastore.v1.Datastore.BeginTransaction:input_type -> google.datastore.v1.BeginTransactionRequest
+	12, // 52: google.datastore.v1.Datastore.Commit:input_type -> google.datastore.v1.CommitRequest
+	10, // 53: google.datastore.v1.Datastore.Rollback:input_type -> google.datastore.v1.RollbackRequest
+	14, // 54: google.datastore.v1.Datastore.AllocateIds:input_type -> google.datastore.v1.AllocateIdsRequest
+	16, // 55: google.datastore.v1.Datastore.ReserveIds:input_type -> google.datastore.v1.ReserveIdsRequest
+	3,  // 56: google.datastore.v1.Datastore.Lookup:output_type -> google.datastore.v1.LookupResponse
+	5,  // 57: google.datastore.v1.Datastore.RunQuery:output_type -> google.datastore.v1.RunQueryResponse
+	7,  // 58: google.datastore.v1.Datastore.RunAggregationQuery:output_type -> google.datastore.v1.RunAggregationQueryResponse
+	9,  // 59: google.datastore.v1.Datastore.BeginTransaction:output_type -> google.datastore.v1.BeginTransactionResponse
+	13, // 60: google.datastore.v1.Datastore.Commit:output_type -> google.datastore.v1.CommitResponse
+	11, // 61: google.datastore.v1.Datastore.Rollback:output_type -> google.datastore.v1.RollbackResponse
+	15, // 62: google.datastore.v1.Datastore.AllocateIds:output_type -> google.datastore.v1.AllocateIdsResponse
+	17, // 63: google.datastore.v1.Datastore.ReserveIds:output_type -> google.datastore.v1.ReserveIdsResponse
+	56, // [56:64] is the sub-list for method output_type
+	48, // [48:56] is the sub-list for method input_type
+	48, // [48:48] is the sub-list for extension type_name
+	48, // [48:48] is the sub-list for extension extendee
+	0,  // [0:48] is the sub-list for field type_name
 }
 
 func init() { file_google_datastore_v1_datastore_proto_init() }
@@ -2848,7 +2971,7 @@ func file_google_datastore_v1_datastore_proto_init() {
 			}
 		}
 		file_google_datastore_v1_datastore_proto_msgTypes[18].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ReadOptions); i {
+			switch v := v.(*PropertyMask); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2860,7 +2983,7 @@ func file_google_datastore_v1_datastore_proto_init() {
 			}
 		}
 		file_google_datastore_v1_datastore_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TransactionOptions); i {
+			switch v := v.(*ReadOptions); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2872,7 +2995,7 @@ func file_google_datastore_v1_datastore_proto_init() {
 			}
 		}
 		file_google_datastore_v1_datastore_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*TransactionOptions_ReadWrite); i {
+			switch v := v.(*TransactionOptions); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2884,6 +3007,18 @@ func file_google_datastore_v1_datastore_proto_init() {
 			}
 		}
 		file_google_datastore_v1_datastore_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*TransactionOptions_ReadWrite); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_google_datastore_v1_datastore_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*TransactionOptions_ReadOnly); i {
 			case 0:
 				return &v.state
@@ -2916,13 +3051,13 @@ func file_google_datastore_v1_datastore_proto_init() {
 		(*Mutation_BaseVersion)(nil),
 		(*Mutation_UpdateTime)(nil),
 	}
-	file_google_datastore_v1_datastore_proto_msgTypes[18].OneofWrappers = []interface{}{
+	file_google_datastore_v1_datastore_proto_msgTypes[19].OneofWrappers = []interface{}{
 		(*ReadOptions_ReadConsistency_)(nil),
 		(*ReadOptions_Transaction)(nil),
 		(*ReadOptions_NewTransaction)(nil),
 		(*ReadOptions_ReadTime)(nil),
 	}
-	file_google_datastore_v1_datastore_proto_msgTypes[19].OneofWrappers = []interface{}{
+	file_google_datastore_v1_datastore_proto_msgTypes[20].OneofWrappers = []interface{}{
 		(*TransactionOptions_ReadWrite_)(nil),
 		(*TransactionOptions_ReadOnly_)(nil),
 	}
@@ -2932,7 +3067,7 @@ func file_google_datastore_v1_datastore_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_datastore_v1_datastore_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   22,
+			NumMessages:   23,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/regen.txt b/regen.txt
index 4ba018218..65a942851 100644
--- a/regen.txt
+++ b/regen.txt
@@ -1 +1 @@
-11ebe1fe2ef20bec96329a9f56a7210140048d10
\ No newline at end of file
+0148e48ace3cf88a50a8c83b06aa7fca3a258762
\ No newline at end of file