diff --git a/LICENSE b/LICENSE
index e33b7fc..0c7ae02 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
-Copyright (c) 2009-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+Copyright (c) 2009-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
 
-Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
 Portions Copyright (c) 1994, The Regents of the University of California
 
 Redistribution and use in source and binary forms, with or without
diff --git a/pg_store_plans.c b/pg_store_plans.c
index e8b0d7c..acbc21b 100644
--- a/pg_store_plans.c
+++ b/pg_store_plans.c
@@ -22,8 +22,8 @@
  * them of the latest execution. Entry eviction is done in the same
  * way to pg_stat_statements.
  *
- * Copyright (c) 2008-2020, PostgreSQL Global Development Group
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2008-2022, PostgreSQL Global Development Group
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pg_store_plans.c
diff --git a/pgsp_explain.c b/pgsp_explain.c
index 6f4ccad..eaef1ee 100644
--- a/pgsp_explain.c
+++ b/pgsp_explain.c
@@ -2,8 +2,8 @@
  *
  * pgsp_explain.c: extracted code from explain.c for explain of triggers.
  *
- * Copyright (c) 2008-2020, PostgreSQL Global Development Group
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2008-2022, PostgreSQL Global Development Group
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_explain.c
diff --git a/pgsp_explain.h b/pgsp_explain.h
index d7bf5c1..9895f07 100644
--- a/pgsp_explain.h
+++ b/pgsp_explain.h
@@ -2,8 +2,8 @@
  *
  * pgsp_explain.h: extracted code from explain.c for explain of triggers.
  *
- * Copyright (c) 2008-2020, PostgreSQL Global Development Group
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2008-2022, PostgreSQL Global Development Group
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_explain.h
diff --git a/pgsp_json.c b/pgsp_json.c
index e0731ec..8c0557d 100644
--- a/pgsp_json.c
+++ b/pgsp_json.c
@@ -2,7 +2,7 @@
  *
  * pgsp_json.c: Plan handler for JSON/XML/YAML style plans
  *
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_json.c
diff --git a/pgsp_json.h b/pgsp_json.h
index c1be953..ae9749c 100644
--- a/pgsp_json.h
+++ b/pgsp_json.h
@@ -2,7 +2,7 @@
  *
  * pgsp_json.h: Definitions of plan handler for JSON/XML/YAML style plans
  *
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_json.h
diff --git a/pgsp_json_int.h b/pgsp_json_int.h
index 1273053..c05179b 100644
--- a/pgsp_json_int.h
+++ b/pgsp_json_int.h
@@ -2,7 +2,7 @@
  *
  * pgsp_json_int.h: Definitions for internal use for pgsp_json.c
  *
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_json_int.h
diff --git a/pgsp_json_text.c b/pgsp_json_text.c
index 5002943..3de6aa4 100644
--- a/pgsp_json_text.c
+++ b/pgsp_json_text.c
@@ -2,7 +2,7 @@
  *
  * pgsp_json_text.h: Text plan generator for pg_store_plans.
  *
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_json_text.c
diff --git a/pgsp_json_text.h b/pgsp_json_text.h
index a01ba71..ed67a4c 100644
--- a/pgsp_json_text.h
+++ b/pgsp_json_text.h
@@ -2,7 +2,7 @@
  *
  * pgsp_json_text.h: Defenitions for text plan generator for pg_store_plans.
  *
- * Copyright (c) 2012-2021, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
+ * Copyright (c) 2012-2022, NIPPON TELEGRAPH AND TELEPHONE CORPORATION
  *
  * IDENTIFICATION
  *	  pg_store_plans/pgsp_json_text.h