diff --git a/src/detail/ca-configuration.cpp b/src/detail/ca-configuration.cpp
index 667d98b..990d84a 100644
--- a/src/detail/ca-configuration.cpp
+++ b/src/detail/ca-configuration.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.
  *
@@ -22,7 +22,6 @@
 
 #include <ndn-cxx/util/io.hpp>
 
-#include <boost/filesystem.hpp>
 #include <boost/property_tree/json_parser.hpp>
 
 namespace ndncert::ca {
diff --git a/src/detail/ca-profile.cpp b/src/detail/ca-profile.cpp
index 41c5d56..f1d8c3f 100644
--- a/src/detail/ca-profile.cpp
+++ b/src/detail/ca-profile.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.
  *
@@ -23,8 +23,6 @@
 
 #include <ndn-cxx/util/io.hpp>
 
-#include <boost/filesystem.hpp>
-
 namespace ndncert {
 
 CaProfile
diff --git a/src/detail/ca-sqlite.cpp b/src/detail/ca-sqlite.cpp
index 3794ce0..809f91f 100644
--- a/src/detail/ca-sqlite.cpp
+++ b/src/detail/ca-sqlite.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.
  *
@@ -25,7 +25,8 @@
 #include <ndn-cxx/security/validation-policy.hpp>
 #include <ndn-cxx/util/sqlite3-statement.hpp>
 
-#include <boost/filesystem.hpp>
+#include <boost/filesystem/operations.hpp>
+#include <boost/filesystem/path.hpp>
 #include <boost/property_tree/json_parser.hpp>
 
 namespace ndncert::ca {