diff --git a/COPYRIGHT b/COPYRIGHT
index 2e2153fe..7693c589 100644
--- a/COPYRIGHT
+++ b/COPYRIGHT
@@ -1,4 +1,4 @@
-Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
 
 Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
 Portions Copyright (c) 1994, The Regents of the University of California
diff --git a/backup.c b/backup.c
index 7547d09c..aaa40a05 100644
--- a/backup.c
+++ b/backup.c
@@ -2,7 +2,7 @@
  *
  * backup.c: backup DB cluster, archived WAL, serverlog.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/catalog.c b/catalog.c
index 80749c6e..456976d8 100644
--- a/catalog.c
+++ b/catalog.c
@@ -2,7 +2,7 @@
  *
  * catalog.c: backup catalog operation
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/data.c b/data.c
index e02fd229..6ee2ffd4 100644
--- a/data.c
+++ b/data.c
@@ -3,7 +3,7 @@
  * data.c: utilities for backing up and restoring database files along with
  * the support for compression/decompression of individual data file pages
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/delete.c b/delete.c
index f75fb326..d62ba692 100644
--- a/delete.c
+++ b/delete.c
@@ -2,7 +2,7 @@
  *
  * delete.c: delete backup files.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/dir.c b/dir.c
index 32531903..0ca4c460 100644
--- a/dir.c
+++ b/dir.c
@@ -2,7 +2,7 @@
  *
  * dir.c: directory operation utility.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/docs/index-ja.html b/docs/index-ja.html
index 08223c03..b6a5d16c 100755
--- a/docs/index-ja.html
+++ b/docs/index-ja.html
@@ -1463,7 +1463,7 @@ <h2>RPMを用いたインストール</h2>
 <h1 id="requirement">動作環境</h2>
 <dl>
 <dt>PostgreSQLバージョン</dt>
-<dd>PostgreSQL 10, 11, 12, 13, 14</dd>
+<dd>PostgreSQL 11, 12, 13, 14, 15</dd>
 <dt>OS</dt>
 <dd>RHEL 8</dd>
 </dl>
@@ -1474,7 +1474,7 @@ <h1 id="seealso">関連項目</h2>
 
 <hr />
 
-<p class="footer">Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
+<p class="footer">Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
 
 </body>
 </html>
diff --git a/docs/index.html b/docs/index.html
index 3102e75f..b79dd7ff 100755
--- a/docs/index.html
+++ b/docs/index.html
@@ -1449,7 +1449,7 @@ <h2 id="Install.from.rpm">Install from rpm package</h2>
 <h1 id="requirement">Requirements</h1>
 <dl>
 <dt>PostgreSQL</dt>
-<dd>PostgreSQL 10, 11, 12, 13, 14</dd>
+<dd>PostgreSQL 11, 12, 13, 14, 15</dd>
 <dt>OS</dt>
 <dd>RHEL 8</dd>
 </dl>
@@ -1460,7 +1460,7 @@ <h1 id="seealso">See Also</h2>
 
 <hr />
 
-<p class="footer">Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
+<p class="footer">Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION</p>
 
 </body>
 </html>
diff --git a/idxpagehdr.h b/idxpagehdr.h
index 093f16c5..63b31f55 100644
--- a/idxpagehdr.h
+++ b/idxpagehdr.h
@@ -13,7 +13,7 @@
  * file!!!  Although, incompatible changes to the definitions in this file
  * will be rare.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/init.c b/init.c
index f0b027be..93c1f31e 100644
--- a/init.c
+++ b/init.c
@@ -2,7 +2,7 @@
  *
  * init.c: manage backup catalog.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/parray.c b/parray.c
index a2cf2986..1123d75e 100644
--- a/parray.c
+++ b/parray.c
@@ -2,7 +2,7 @@
  *
  * parray.c: pointer array collection.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/parray.h b/parray.h
index 0c5fa26d..8b6c8844 100644
--- a/parray.h
+++ b/parray.h
@@ -2,7 +2,7 @@
  *
  * parray.h: pointer array collection.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pg_rman.c b/pg_rman.c
index 6b1084b2..de09512a 100644
--- a/pg_rman.c
+++ b/pg_rman.c
@@ -2,7 +2,7 @@
  *
  * pg_rman.c: Backup/Recovery manager for PostgreSQL.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pg_rman.h b/pg_rman.h
index e2127776..2bc24d6d 100644
--- a/pg_rman.h
+++ b/pg_rman.h
@@ -2,7 +2,7 @@
  *
  * pg_rman.h: Backup/Recovery manager for PostgreSQL.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut-port.c b/pgut/pgut-port.c
index ca0612f4..d2ccba3b 100644
--- a/pgut/pgut-port.c
+++ b/pgut/pgut-port.c
@@ -2,7 +2,7 @@
  *
  * pgut-port.c
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut-port.h b/pgut/pgut-port.h
index cc483318..1e089a70 100644
--- a/pgut/pgut-port.h
+++ b/pgut/pgut-port.h
@@ -2,7 +2,7 @@
  *
  * pgut-port.h
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut.c b/pgut/pgut.c
index 36c8c5ac..51fd3560 100644
--- a/pgut/pgut.c
+++ b/pgut/pgut.c
@@ -2,7 +2,7 @@
  *
  * pgut.c
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/pgut/pgut.h b/pgut/pgut.h
index 6ce47afe..7fc6cdc1 100644
--- a/pgut/pgut.h
+++ b/pgut/pgut.h
@@ -2,7 +2,7 @@
  *
  * pgut.h
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/restore.c b/restore.c
index 437ad2bc..58a45806 100644
--- a/restore.c
+++ b/restore.c
@@ -2,7 +2,7 @@
  *
  * restore.c: restore DB cluster and archived WAL.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/script/snapshot_script_lvm.sh b/script/snapshot_script_lvm.sh
index c68f6b9c..7797ec1c 100644
--- a/script/snapshot_script_lvm.sh
+++ b/script/snapshot_script_lvm.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 #############################################################################
-#  Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+#  Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
 #############################################################################
 
 CMD_SUDO="/usr/bin/sudo"
diff --git a/show.c b/show.c
index 480ba5bc..9f10cfae 100644
--- a/show.c
+++ b/show.c
@@ -2,7 +2,7 @@
  *
  * show.c: show backup catalog.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/util.c b/util.c
index 90db132e..bbccc718 100644
--- a/util.c
+++ b/util.c
@@ -2,7 +2,7 @@
  *
  * util.c: log messages to log file or stderr, and misc code.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/validate.c b/validate.c
index 5774f5f6..0d8df757 100644
--- a/validate.c
+++ b/validate.c
@@ -2,7 +2,7 @@
  *
  * validate.c: validate backup files.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */
diff --git a/xlog.c b/xlog.c
index e137cd29..1d0af10a 100644
--- a/xlog.c
+++ b/xlog.c
@@ -2,7 +2,7 @@
  *
  * xlog.c: Parse WAL files.
  *
- * Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  *-------------------------------------------------------------------------
  */