diff --git a/Makefile b/Makefile
index 2083ff2..18699c4 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ PGFILEDESC = "pg_ivm - incremental view maintenance on PostgreSQL"
 EXTENSION = pg_ivm
 DATA = pg_ivm--1.0.sql \
        pg_ivm--1.0--1.1.sql pg_ivm--1.1--1.2.sql pg_ivm--1.2--1.3.sql \
-       pg_ivm--1.3--1.4.sql
+       pg_ivm--1.3--1.4.sql pg_ivm--1.4--1.5.sql
 
 REGRESS = pg_ivm create_immv refresh_immv
 
diff --git a/pg_ivm--1.4--1.5.sql b/pg_ivm--1.4--1.5.sql
new file mode 100644
index 0000000..e69de29
diff --git a/pg_ivm.control b/pg_ivm.control
index 4524ccd..b94d7bc 100644
--- a/pg_ivm.control
+++ b/pg_ivm.control
@@ -1,6 +1,6 @@
 # incremental view maintenance extension_
 comment = 'incremental view maintenance on PostgreSQL'
-default_version = '1.4'
+default_version = '1.5'
 module_pathname = '$libdir/pg_ivm'
 relocatable = false 
 schema = pg_catalog
diff --git a/rpm/pg_ivm.spec b/rpm/pg_ivm.spec
index 8500f83..21d4f4e 100644
--- a/rpm/pg_ivm.spec
+++ b/rpm/pg_ivm.spec
@@ -10,7 +10,7 @@
 
 Summary:	PostgreSQL-based distributed RDBMS
 Name:		%{sname}_%{pgmajorversion}
-Version:	1.4
+Version:	1.5
 Release:	1%{dist}
 License:    BSD
 Vendor:     IVM Development Group
@@ -55,6 +55,8 @@ PATH=%{pginstdir}/bin:$PATH %{__make} %{?_smp_mflags} INSTALL_PREFIX=%{buildroot
 %endif
 
 %changelog
+* Mon Jun 30 2023 - Yugo Nagata <nagata@sraoss.co.jp> 1.5-1
+- Update to 1.4
 * Fri Dec 16 2022 - Yugo Nagata <nagata@sraoss.co.jp> 1.4-1
 - Update to 1.4
 * Fri Sep 30 2022 - Yugo Nagata <nagata@sraoss.co.jp> 1.3-1