diff --git a/tools/chunks/catchunks/discover-version.hpp b/tools/chunks/catchunks/discover-version.hpp
index 62a5e42..6a05727 100644
--- a/tools/chunks/catchunks/discover-version.hpp
+++ b/tools/chunks/catchunks/discover-version.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2016-2021, Regents of the University of California,
+ * Copyright (c) 2016-2022, Regents of the University of California,
  *                          Colorado State University,
  *                          University Pierre & Marie Curie, Sorbonne University.
  *
@@ -33,8 +33,7 @@
 
 #include <ndn-cxx/util/signal.hpp>
 
-namespace ndn {
-namespace chunks {
+namespace ndn::chunks {
 
 class DataFetcher;
 
@@ -73,7 +72,6 @@
   shared_ptr<DataFetcher> m_fetcher;
 };
 
-} // namespace chunks
-} // namespace ndn
+} // namespace ndn::chunks
 
 #endif // NDN_TOOLS_CHUNKS_CATCHUNKS_DISCOVER_VERSION_HPP