diff --git a/daemon/face/ethernet-channel.hpp b/daemon/face/ethernet-channel.hpp
index 36d32be..7e7fa87 100644
--- a/daemon/face/ethernet-channel.hpp
+++ b/daemon/face/ethernet-channel.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -29,6 +29,7 @@
 #include "channel.hpp"
 #include "ethernet-protocol.hpp"
 #include "pcap-helper.hpp"
+
 #include <ndn-cxx/net/network-interface.hpp>
 
 namespace nfd {
@@ -37,7 +38,7 @@
 /**
  * \brief Class implementing Ethernet-based channel to create faces
  */
-class EthernetChannel : public Channel
+class EthernetChannel final : public Channel
 {
 public:
   /**
@@ -63,13 +64,13 @@
                   time::nanoseconds idleTimeout);
 
   bool
-  isListening() const override
+  isListening() const final
   {
     return m_isListening;
   }
 
   size_t
-  size() const override
+  size() const final
   {
     return m_channelFaces.size();
   }
diff --git a/daemon/face/ethernet-factory.hpp b/daemon/face/ethernet-factory.hpp
index 9b25b3c..578a901 100644
--- a/daemon/face/ethernet-factory.hpp
+++ b/daemon/face/ethernet-factory.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -34,7 +34,7 @@
 
 /** \brief Protocol factory for Ethernet
  */
-class EthernetFactory : public ProtocolFactory
+class EthernetFactory final : public ProtocolFactory
 {
 public:
   static const std::string&
@@ -77,15 +77,15 @@
    */
   void
   doProcessConfig(OptionalConfigSection configSection,
-                  FaceSystem::ConfigContext& context) override;
+                  FaceSystem::ConfigContext& context) final;
 
   void
   doCreateFace(const CreateFaceRequest& req,
                const FaceCreatedCallback& onCreated,
-               const FaceCreationFailedCallback& onFailure) override;
+               const FaceCreationFailedCallback& onFailure) final;
 
   std::vector<shared_ptr<const Channel>>
-  doGetChannels() const override;
+  doGetChannels() const final;
 
   /** \brief Create EthernetChannel on \p netif if requested by \p m_unicastConfig.
    *  \return new or existing channel, or nullptr if no channel should be created
diff --git a/daemon/face/tcp-channel.hpp b/daemon/face/tcp-channel.hpp
index cb41b2c..788fdc1 100644
--- a/daemon/face/tcp-channel.hpp
+++ b/daemon/face/tcp-channel.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2019,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -46,7 +46,7 @@
  * connections (TcpChannel::listen needs to be called for that
  * to work) or explicitly after using TcpChannel::connect method.
  */
-class TcpChannel : public Channel
+class TcpChannel final : public Channel
 {
 public:
   /**
@@ -59,13 +59,13 @@
              DetermineFaceScopeFromAddress determineFaceScope);
 
   bool
-  isListening() const override
+  isListening() const final
   {
     return m_acceptor.is_open();
   }
 
   size_t
-  size() const override
+  size() const final
   {
     return m_channelFaces.size();
   }
diff --git a/daemon/face/tcp-factory.hpp b/daemon/face/tcp-factory.hpp
index 519d2dc..212acbb 100644
--- a/daemon/face/tcp-factory.hpp
+++ b/daemon/face/tcp-factory.hpp
@@ -34,7 +34,7 @@
 
 /** \brief Protocol factory for TCP over IPv4 and IPv6
  */
-class TcpFactory : public ProtocolFactory
+class TcpFactory final : public ProtocolFactory
 {
 public:
   static const std::string&
@@ -61,15 +61,15 @@
    */
   void
   doProcessConfig(OptionalConfigSection configSection,
-                  FaceSystem::ConfigContext& context) override;
+                  FaceSystem::ConfigContext& context) final;
 
   void
   doCreateFace(const CreateFaceRequest& req,
                const FaceCreatedCallback& onCreated,
-               const FaceCreationFailedCallback& onFailure) override;
+               const FaceCreationFailedCallback& onFailure) final;
 
   std::vector<shared_ptr<const Channel>>
-  doGetChannels() const override;
+  doGetChannels() const final;
 
   ndn::nfd::FaceScope
   determineFaceScopeFromAddresses(const boost::asio::ip::address& local,
diff --git a/daemon/face/udp-channel.hpp b/daemon/face/udp-channel.hpp
index c3f696d..25e735a 100644
--- a/daemon/face/udp-channel.hpp
+++ b/daemon/face/udp-channel.hpp
@@ -37,7 +37,7 @@
 /**
  * \brief Class implementing UDP-based channel to create faces
  */
-class UdpChannel : public Channel
+class UdpChannel final : public Channel
 {
 public:
   /**
@@ -53,13 +53,13 @@
              size_t defaultMtu);
 
   bool
-  isListening() const override
+  isListening() const final
   {
     return m_socket.is_open();
   }
 
   size_t
-  size() const override
+  size() const final
   {
     return m_channelFaces.size();
   }
diff --git a/daemon/face/udp-factory.hpp b/daemon/face/udp-factory.hpp
index a0f5b6d..28dbfaa 100644
--- a/daemon/face/udp-factory.hpp
+++ b/daemon/face/udp-factory.hpp
@@ -34,7 +34,7 @@
 
 /** \brief Protocol factory for UDP over IPv4 and IPv6
  */
-class UdpFactory : public ProtocolFactory
+class UdpFactory final : public ProtocolFactory
 {
 public:
   class Error : public ProtocolFactory::Error
@@ -100,15 +100,15 @@
    */
   void
   doProcessConfig(OptionalConfigSection configSection,
-                  FaceSystem::ConfigContext& context) override;
+                  FaceSystem::ConfigContext& context) final;
 
   void
   doCreateFace(const CreateFaceRequest& req,
                const FaceCreatedCallback& onCreated,
-               const FaceCreationFailedCallback& onFailure) override;
+               const FaceCreationFailedCallback& onFailure) final;
 
   std::vector<shared_ptr<const Channel>>
-  doGetChannels() const override;
+  doGetChannels() const final;
 
   /** \brief Create UDP multicast faces on \p netif if needed by \p m_mcastConfig
    *  \return list of faces (just created or already existing) on \p netif
diff --git a/daemon/face/unix-stream-channel.hpp b/daemon/face/unix-stream-channel.hpp
index 6a49667..1faffa8 100644
--- a/daemon/face/unix-stream-channel.hpp
+++ b/daemon/face/unix-stream-channel.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -42,7 +42,7 @@
  * Channel can create faces as a response to incoming IPC connections
  * (UnixStreamChannel::listen needs to be called for that to work).
  */
-class UnixStreamChannel : public Channel
+class UnixStreamChannel final : public Channel
 {
 public:
   /**
@@ -66,16 +66,16 @@
    */
   UnixStreamChannel(const unix_stream::Endpoint& endpoint, bool wantCongestionMarking);
 
-  ~UnixStreamChannel() override;
+  ~UnixStreamChannel() final;
 
   bool
-  isListening() const override
+  isListening() const final
   {
     return m_acceptor.is_open();
   }
 
   size_t
-  size() const override
+  size() const final
   {
     return m_size;
   }
diff --git a/daemon/face/unix-stream-factory.hpp b/daemon/face/unix-stream-factory.hpp
index 8e4bee5..45be220 100644
--- a/daemon/face/unix-stream-factory.hpp
+++ b/daemon/face/unix-stream-factory.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -34,7 +34,7 @@
 
 /** \brief Protocol factory for stream-oriented Unix sockets
  */
-class UnixStreamFactory : public ProtocolFactory
+class UnixStreamFactory final : public ProtocolFactory
 {
 public:
   static const std::string&
@@ -60,10 +60,10 @@
    */
   void
   doProcessConfig(OptionalConfigSection configSection,
-                  FaceSystem::ConfigContext& context) override;
+                  FaceSystem::ConfigContext& context) final;
 
   std::vector<shared_ptr<const Channel>>
-  doGetChannels() const override;
+  doGetChannels() const final;
 
 private:
   bool m_wantCongestionMarking = false;
diff --git a/daemon/face/websocket-channel.hpp b/daemon/face/websocket-channel.hpp
index 1409289..1729841 100644
--- a/daemon/face/websocket-channel.hpp
+++ b/daemon/face/websocket-channel.hpp
@@ -40,7 +40,7 @@
 /**
  * \brief Class implementing WebSocket-based channel to create faces
  */
-class WebSocketChannel : public Channel
+class WebSocketChannel final : public Channel
 {
 public:
   /**
@@ -54,13 +54,13 @@
   WebSocketChannel(const websocket::Endpoint& localEndpoint);
 
   bool
-  isListening() const override
+  isListening() const final
   {
     return m_server.is_listening();
   }
 
   size_t
-  size() const override
+  size() const final
   {
     return m_channelFaces.size();
   }
diff --git a/daemon/face/websocket-factory.hpp b/daemon/face/websocket-factory.hpp
index a4b6a46..721a1eb 100644
--- a/daemon/face/websocket-factory.hpp
+++ b/daemon/face/websocket-factory.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2014-2018,  Regents of the University of California,
+ * Copyright (c) 2014-2021,  Regents of the University of California,
  *                           Arizona Board of Regents,
  *                           Colorado State University,
  *                           University Pierre & Marie Curie, Sorbonne University,
@@ -34,7 +34,7 @@
 
 /** \brief Protocol factory for WebSocket
  */
-class WebSocketFactory : public ProtocolFactory
+class WebSocketFactory final : public ProtocolFactory
 {
 public:
   static const std::string&
@@ -62,10 +62,10 @@
    */
   void
   doProcessConfig(OptionalConfigSection configSection,
-                  FaceSystem::ConfigContext& context) override;
+                  FaceSystem::ConfigContext& context) final;
 
   std::vector<shared_ptr<const Channel>>
-  doGetChannels() const override;
+  doGetChannels() const final;
 
 private:
   std::map<websocket::Endpoint, shared_ptr<WebSocketChannel>> m_channels;