diff --git a/tests/unit/tag.t.cpp b/tests/unit/tag.t.cpp
index 0cbae22..9b4f1a6 100644
--- a/tests/unit/tag.t.cpp
+++ b/tests/unit/tag.t.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2013-2018 Regents of the University of California.
+ * Copyright (c) 2013-2023 Regents of the University of California.
  *
  * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
  *
@@ -23,14 +23,13 @@
 
 #include "tests/boost-test.hpp"
 
-namespace ndn {
-namespace tests {
+namespace ndn::tests {
 
 BOOST_AUTO_TEST_SUITE(TestTag)
 
 BOOST_AUTO_TEST_CASE(SimpleTag)
 {
-  typedef ndn::SimpleTag<int, 3> MyTag;
+  using MyTag = ndn::SimpleTag<int, 3>;
 
   BOOST_CHECK_EQUAL(MyTag::getTypeId(), 3);
   MyTag tag(23361); // explicitly convertible from value type
@@ -41,5 +40,4 @@
 
 BOOST_AUTO_TEST_SUITE_END() // TestTag
 
-} // namespace tests
-} // namespace ndn
+} // namespace ndn::tests