diff --git a/accounting/grpc/types_frostfs.pb.go b/accounting/grpc/types_frostfs.pb.go
index 438cd03..8585583 100644
Binary files a/accounting/grpc/types_frostfs.pb.go and b/accounting/grpc/types_frostfs.pb.go differ
diff --git a/acl/grpc/types_frostfs.pb.go b/acl/grpc/types_frostfs.pb.go
index 6ebaf63..1ba6c53 100644
Binary files a/acl/grpc/types_frostfs.pb.go and b/acl/grpc/types_frostfs.pb.go differ
diff --git a/netmap/grpc/types_frostfs.pb.go b/netmap/grpc/types_frostfs.pb.go
index 24b7575..a4b10f9 100644
Binary files a/netmap/grpc/types_frostfs.pb.go and b/netmap/grpc/types_frostfs.pb.go differ
diff --git a/object/grpc/service_frostfs.pb.go b/object/grpc/service_frostfs.pb.go
index 0130ee3..f934f3b 100644
Binary files a/object/grpc/service_frostfs.pb.go and b/object/grpc/service_frostfs.pb.go differ
diff --git a/object/grpc/types_frostfs.pb.go b/object/grpc/types_frostfs.pb.go
index bc246cf..0ee939a 100644
Binary files a/object/grpc/types_frostfs.pb.go and b/object/grpc/types_frostfs.pb.go differ
diff --git a/session/grpc/service_frostfs.pb.go b/session/grpc/service_frostfs.pb.go
index 71a6a41..c71325a 100644
Binary files a/session/grpc/service_frostfs.pb.go and b/session/grpc/service_frostfs.pb.go differ
diff --git a/session/grpc/types_frostfs.pb.go b/session/grpc/types_frostfs.pb.go
index 1b6a664..e18c1ab 100644
Binary files a/session/grpc/types_frostfs.pb.go and b/session/grpc/types_frostfs.pb.go differ
diff --git a/tombstone/grpc/types_frostfs.pb.go b/tombstone/grpc/types_frostfs.pb.go
index 0971045..e5b67d5 100644
Binary files a/tombstone/grpc/types_frostfs.pb.go and b/tombstone/grpc/types_frostfs.pb.go differ
diff --git a/util/proto/test/custom/test_frostfs.pb.go b/util/proto/test/custom/test_frostfs.pb.go
index 15e77af..3804e46 100644
Binary files a/util/proto/test/custom/test_frostfs.pb.go and b/util/proto/test/custom/test_frostfs.pb.go differ
diff --git a/util/protogen/internalgengo/json.go b/util/protogen/internalgengo/json.go
index 4d7f4be..3267955 100644
--- a/util/protogen/internalgengo/json.go
+++ b/util/protogen/internalgengo/json.go
@@ -231,9 +231,15 @@ func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name strin
 	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
 		template = "out.Uint32(%s)"
 	case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
-		template = "out.Int64(%s)"
+		g.P("out.RawByte('\"')")
+		g.P("out.Buffer.Buf = ", strconvPackage.Ident("AppendInt"), "(out.Buffer.Buf, ", selector, ", 10)")
+		g.P("out.RawByte('\"')")
+		return
 	case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
-		template = "out.Uint64(%s)"
+		g.P("out.RawByte('\"')")
+		g.P("out.Buffer.Buf = ", strconvPackage.Ident("AppendUint"), "(out.Buffer.Buf, ", selector, ", 10)")
+		g.P("out.RawByte('\"')")
+		return
 	case protoreflect.FloatKind:
 		template = "out.Float32(%s)"
 	case protoreflect.DoubleKind: