diff --git a/cybozu/validate/options.pb.go b/cybozu/validate/options.pb.go
index 7552d0c..5bba355 100644
--- a/cybozu/validate/options.pb.go
+++ b/cybozu/validate/options.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.34.2
+// 	protoc-gen-go v1.35.2
 // 	protoc        (unknown)
 // source: cybozu/validate/options.proto
 
@@ -145,11 +145,9 @@ type FieldRules struct {
 
 func (x *FieldRules) Reset() {
 	*x = FieldRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *FieldRules) String() string {
@@ -160,7 +158,7 @@ func (*FieldRules) ProtoMessage() {}
 
 func (x *FieldRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -478,11 +476,9 @@ type ItemsRules struct {
 
 func (x *ItemsRules) Reset() {
 	*x = ItemsRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *ItemsRules) String() string {
@@ -493,7 +489,7 @@ func (*ItemsRules) ProtoMessage() {}
 
 func (x *ItemsRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -540,11 +536,9 @@ type FloatRules struct {
 
 func (x *FloatRules) Reset() {
 	*x = FloatRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *FloatRules) String() string {
@@ -555,7 +549,7 @@ func (*FloatRules) ProtoMessage() {}
 
 func (x *FloatRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -616,11 +610,9 @@ type DoubleRules struct {
 
 func (x *DoubleRules) Reset() {
 	*x = DoubleRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *DoubleRules) String() string {
@@ -631,7 +623,7 @@ func (*DoubleRules) ProtoMessage() {}
 
 func (x *DoubleRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -692,11 +684,9 @@ type Int32Rules struct {
 
 func (x *Int32Rules) Reset() {
 	*x = Int32Rules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[4]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Int32Rules) String() string {
@@ -707,7 +697,7 @@ func (*Int32Rules) ProtoMessage() {}
 
 func (x *Int32Rules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[4]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -768,11 +758,9 @@ type Int64Rules struct {
 
 func (x *Int64Rules) Reset() {
 	*x = Int64Rules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[5]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Int64Rules) String() string {
@@ -783,7 +771,7 @@ func (*Int64Rules) ProtoMessage() {}
 
 func (x *Int64Rules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[5]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -844,11 +832,9 @@ type Uint32Rules struct {
 
 func (x *Uint32Rules) Reset() {
 	*x = Uint32Rules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[6]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Uint32Rules) String() string {
@@ -859,7 +845,7 @@ func (*Uint32Rules) ProtoMessage() {}
 
 func (x *Uint32Rules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[6]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -920,11 +906,9 @@ type Uint64Rules struct {
 
 func (x *Uint64Rules) Reset() {
 	*x = Uint64Rules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[7]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Uint64Rules) String() string {
@@ -935,7 +919,7 @@ func (*Uint64Rules) ProtoMessage() {}
 
 func (x *Uint64Rules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[7]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -988,11 +972,9 @@ type BoolRules struct {
 
 func (x *BoolRules) Reset() {
 	*x = BoolRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[8]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[8]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *BoolRules) String() string {
@@ -1003,7 +985,7 @@ func (*BoolRules) ProtoMessage() {}
 
 func (x *BoolRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[8]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1051,11 +1033,9 @@ type StringRules struct {
 
 func (x *StringRules) Reset() {
 	*x = StringRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[9]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *StringRules) String() string {
@@ -1066,7 +1046,7 @@ func (*StringRules) ProtoMessage() {}
 
 func (x *StringRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[9]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1188,11 +1168,9 @@ type BytesRules struct {
 
 func (x *BytesRules) Reset() {
 	*x = BytesRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[10]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[10]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *BytesRules) String() string {
@@ -1203,7 +1181,7 @@ func (*BytesRules) ProtoMessage() {}
 
 func (x *BytesRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[10]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1247,11 +1225,9 @@ type EnumRules struct {
 
 func (x *EnumRules) Reset() {
 	*x = EnumRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[11]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[11]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *EnumRules) String() string {
@@ -1262,7 +1238,7 @@ func (*EnumRules) ProtoMessage() {}
 
 func (x *EnumRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[11]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1304,11 +1280,9 @@ type MessageRules struct {
 
 func (x *MessageRules) Reset() {
 	*x = MessageRules{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_cybozu_validate_options_proto_msgTypes[12]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_cybozu_validate_options_proto_msgTypes[12]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *MessageRules) String() string {
@@ -1319,7 +1293,7 @@ func (*MessageRules) ProtoMessage() {}
 
 func (x *MessageRules) ProtoReflect() protoreflect.Message {
 	mi := &file_cybozu_validate_options_proto_msgTypes[12]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1662,164 +1636,6 @@ func file_cybozu_validate_options_proto_init() {
 	if File_cybozu_validate_options_proto != nil {
 		return
 	}
-	if !protoimpl.UnsafeEnabled {
-		file_cybozu_validate_options_proto_msgTypes[0].Exporter = func(v any, i int) any {
-			switch v := v.(*FieldRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[1].Exporter = func(v any, i int) any {
-			switch v := v.(*ItemsRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[2].Exporter = func(v any, i int) any {
-			switch v := v.(*FloatRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[3].Exporter = func(v any, i int) any {
-			switch v := v.(*DoubleRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[4].Exporter = func(v any, i int) any {
-			switch v := v.(*Int32Rules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[5].Exporter = func(v any, i int) any {
-			switch v := v.(*Int64Rules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[6].Exporter = func(v any, i int) any {
-			switch v := v.(*Uint32Rules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[7].Exporter = func(v any, i int) any {
-			switch v := v.(*Uint64Rules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[8].Exporter = func(v any, i int) any {
-			switch v := v.(*BoolRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[9].Exporter = func(v any, i int) any {
-			switch v := v.(*StringRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[10].Exporter = func(v any, i int) any {
-			switch v := v.(*BytesRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[11].Exporter = func(v any, i int) any {
-			switch v := v.(*EnumRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_cybozu_validate_options_proto_msgTypes[12].Exporter = func(v any, i int) any {
-			switch v := v.(*MessageRules); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
 	file_cybozu_validate_options_proto_msgTypes[0].OneofWrappers = []any{
 		(*FieldRules_Float)(nil),
 		(*FieldRules_Double)(nil),
diff --git a/examples/validation.pb.go b/examples/validation.pb.go
index 018f903..2edea98 100644
--- a/examples/validation.pb.go
+++ b/examples/validation.pb.go
@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.34.2
+// 	protoc-gen-go v1.35.2
 // 	protoc        (unknown)
 // source: examples/validation.proto
 
@@ -83,11 +83,9 @@ type Ignored struct {
 
 func (x *Ignored) Reset() {
 	*x = Ignored{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[0]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[0]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Ignored) String() string {
@@ -98,7 +96,7 @@ func (*Ignored) ProtoMessage() {}
 
 func (x *Ignored) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[0]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -152,11 +150,9 @@ type Scalars struct {
 
 func (x *Scalars) Reset() {
 	*x = Scalars{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[1]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[1]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Scalars) String() string {
@@ -167,7 +163,7 @@ func (*Scalars) ProtoMessage() {}
 
 func (x *Scalars) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[1]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -312,11 +308,9 @@ type OptionalScalars struct {
 
 func (x *OptionalScalars) Reset() {
 	*x = OptionalScalars{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[2]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *OptionalScalars) String() string {
@@ -327,7 +321,7 @@ func (*OptionalScalars) ProtoMessage() {}
 
 func (x *OptionalScalars) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[2]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -462,11 +456,9 @@ type RepeatedScalars struct {
 
 func (x *RepeatedScalars) Reset() {
 	*x = RepeatedScalars{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[3]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[3]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *RepeatedScalars) String() string {
@@ -477,7 +469,7 @@ func (*RepeatedScalars) ProtoMessage() {}
 
 func (x *RepeatedScalars) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[3]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -547,11 +539,9 @@ type Strings struct {
 
 func (x *Strings) Reset() {
 	*x = Strings{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[4]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[4]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Strings) String() string {
@@ -562,7 +552,7 @@ func (*Strings) ProtoMessage() {}
 
 func (x *Strings) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[4]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -668,11 +658,9 @@ type Maps struct {
 
 func (x *Maps) Reset() {
 	*x = Maps{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[5]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[5]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Maps) String() string {
@@ -683,7 +671,7 @@ func (*Maps) ProtoMessage() {}
 
 func (x *Maps) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[5]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -743,11 +731,9 @@ type Enums struct {
 
 func (x *Enums) Reset() {
 	*x = Enums{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[6]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[6]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Enums) String() string {
@@ -758,7 +744,7 @@ func (*Enums) ProtoMessage() {}
 
 func (x *Enums) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[6]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -820,11 +806,9 @@ type Oneofs struct {
 
 func (x *Oneofs) Reset() {
 	*x = Oneofs{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[7]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[7]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Oneofs) String() string {
@@ -835,7 +819,7 @@ func (*Oneofs) ProtoMessage() {}
 
 func (x *Oneofs) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[7]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -940,11 +924,9 @@ type Composed struct {
 
 func (x *Composed) Reset() {
 	*x = Composed{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[8]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[8]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Composed) String() string {
@@ -955,7 +937,7 @@ func (*Composed) ProtoMessage() {}
 
 func (x *Composed) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[8]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1008,11 +990,9 @@ type Nested struct {
 
 func (x *Nested) Reset() {
 	*x = Nested{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[9]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Nested) String() string {
@@ -1023,7 +1003,7 @@ func (*Nested) ProtoMessage() {}
 
 func (x *Nested) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[9]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1056,11 +1036,9 @@ type Nested_Inner struct {
 
 func (x *Nested_Inner) Reset() {
 	*x = Nested_Inner{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_examples_validation_proto_msgTypes[14]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
+	mi := &file_examples_validation_proto_msgTypes[14]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
 }
 
 func (x *Nested_Inner) String() string {
@@ -1071,7 +1049,7 @@ func (*Nested_Inner) ProtoMessage() {}
 
 func (x *Nested_Inner) ProtoReflect() protoreflect.Message {
 	mi := &file_examples_validation_proto_msgTypes[14]
-	if protoimpl.UnsafeEnabled && x != nil {
+	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
 			ms.StoreMessageInfo(mi)
@@ -1358,140 +1336,6 @@ func file_examples_validation_proto_init() {
 	if File_examples_validation_proto != nil {
 		return
 	}
-	if !protoimpl.UnsafeEnabled {
-		file_examples_validation_proto_msgTypes[0].Exporter = func(v any, i int) any {
-			switch v := v.(*Ignored); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[1].Exporter = func(v any, i int) any {
-			switch v := v.(*Scalars); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[2].Exporter = func(v any, i int) any {
-			switch v := v.(*OptionalScalars); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[3].Exporter = func(v any, i int) any {
-			switch v := v.(*RepeatedScalars); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[4].Exporter = func(v any, i int) any {
-			switch v := v.(*Strings); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[5].Exporter = func(v any, i int) any {
-			switch v := v.(*Maps); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[6].Exporter = func(v any, i int) any {
-			switch v := v.(*Enums); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[7].Exporter = func(v any, i int) any {
-			switch v := v.(*Oneofs); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[8].Exporter = func(v any, i int) any {
-			switch v := v.(*Composed); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[9].Exporter = func(v any, i int) any {
-			switch v := v.(*Nested); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_examples_validation_proto_msgTypes[14].Exporter = func(v any, i int) any {
-			switch v := v.(*Nested_Inner); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-	}
 	file_examples_validation_proto_msgTypes[2].OneofWrappers = []any{}
 	file_examples_validation_proto_msgTypes[6].OneofWrappers = []any{}
 	file_examples_validation_proto_msgTypes[7].OneofWrappers = []any{
diff --git a/go.mod b/go.mod
index cdffc21..a650d7f 100644
--- a/go.mod
+++ b/go.mod
@@ -1,13 +1,11 @@
 module github.com/cybozu/protobuf
 
-go 1.22
-
-toolchain go1.22.1
+go 1.23.3
 
 require (
-	github.com/stretchr/testify v1.9.0
-	golang.org/x/text v0.18.0
-	google.golang.org/protobuf v1.34.2
+	github.com/stretchr/testify v1.10.0
+	golang.org/x/text v0.20.0
+	google.golang.org/protobuf v1.35.2
 )
 
 require (
diff --git a/go.sum b/go.sum
index 10cdb2f..714e2d7 100644
--- a/go.sum
+++ b/go.sum
@@ -4,14 +4,14 @@ github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
-github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
-golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
-golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
+github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
+golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
+golang.org/x/text v0.20.0/go.mod h1:D4IsuqiFMhST5bX19pQ9ikHC2GsaKyk/oF+pn3ducp4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
-google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
+google.golang.org/protobuf v1.35.2 h1:8Ar7bF+apOIoThw1EdZl0p1oWvMqTHmpA2fRTyZO8io=
+google.golang.org/protobuf v1.35.2/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=