diff --git a/src/challenge/challenge-email.cpp b/src/challenge/challenge-email.cpp
index 01bb7ba..c4de9ce 100644
--- a/src/challenge/challenge-email.cpp
+++ b/src/challenge/challenge-email.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2017-2022, Regents of the University of California.
+ * Copyright (c) 2017-2024, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -19,6 +19,9 @@
  */
 
 #include "challenge-email.hpp"
+
+#include <ndn-cxx/util/logger.hpp>
+
 #include <regex>
 #include <boost/process.hpp>
 
diff --git a/src/challenge/challenge-module.hpp b/src/challenge/challenge-module.hpp
index a0c7b60..b3baefb 100644
--- a/src/challenge/challenge-module.hpp
+++ b/src/challenge/challenge-module.hpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2017-2022, Regents of the University of California.
+ * Copyright (c) 2017-2024, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -24,6 +24,7 @@
 #include "detail/ca-request-state.hpp"
 
 #include <map>
+#include <tuple>
 
 namespace ndncert {
 
diff --git a/src/challenge/challenge-pin.cpp b/src/challenge/challenge-pin.cpp
index 46f65fd..2662055 100644
--- a/src/challenge/challenge-pin.cpp
+++ b/src/challenge/challenge-pin.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2017-2022, Regents of the University of California.
+ * Copyright (c) 2017-2024, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -20,6 +20,7 @@
 
 #include "challenge-pin.hpp"
 
+#include <ndn-cxx/util/logger.hpp>
 #include <ndn-cxx/util/random.hpp>
 
 namespace ndncert {
diff --git a/src/challenge/challenge-possession.cpp b/src/challenge/challenge-possession.cpp
index 20b0127..2473f29 100644
--- a/src/challenge/challenge-possession.cpp
+++ b/src/challenge/challenge-possession.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2023, Regents of the University of California.
+ * Copyright (c) 2017-2024, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -23,6 +23,7 @@
 #include <ndn-cxx/security/transform/public-key.hpp>
 #include <ndn-cxx/security/verification-helpers.hpp>
 #include <ndn-cxx/util/io.hpp>
+#include <ndn-cxx/util/logger.hpp>
 #include <ndn-cxx/util/random.hpp>
 
 #include <boost/property_tree/json_parser.hpp>