diff --git a/libecpg-12.2-dependency-build.patch b/libecpg-12.2-dependency-build.patch
index 8895434..b1fd2af 100644
--- a/libecpg-12.2-dependency-build.patch
+++ b/libecpg-12.2-dependency-build.patch
@@ -5,7 +5,7 @@ diff -ur postgresql-14.4_original/src/interfaces/libpq/Makefile postgresql-14.4/
  PKG_CONFIG_REQUIRES_PRIVATE = libssl libcrypto
  endif
  
--all: all-lib
+-all: all-lib libpq-refs-stamp
 -
  # Shared library stuff
  include $(top_srcdir)/src/Makefile.shlib
diff --git a/libecpg.spec b/libecpg.spec
index 5cee570..2a43c64 100644
--- a/libecpg.spec
+++ b/libecpg.spec
@@ -1,9 +1,9 @@
-%global majorversion 14
+%global majorversion 15
 
 Summary: ECPG - Embedded SQL in C
 Name: libecpg
 Version: %majorversion.4
-Release: 5%{?dist}
+Release: 1%{?dist}
 
 License: PostgreSQL
 Url: http://www.postgresql.org/
@@ -131,11 +131,9 @@ find_lang_bins %name-devel.lst  ecpg
 
 
 %changelog
-* Thu Jul 20 2023 Fedora Release Engineering <releng@fedoraproject.org> - 14.4-5
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild
-
-* Thu Jan 19 2023 Fedora Release Engineering <releng@fedoraproject.org> - 14.4-4
-- Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild
+* Fri Jun 02 2023 Ondrej Sloup <osloup@redhat.com> - 15.4-1
+- Rebase to the latest upstream version
+- Updated dependency patch file to match the rebase
 
 * Thu Sep 1 2022 Ondřej Sloup <osloup@redhat.com> - 14.4-3
 - Raise the release number as dependencies change enabled a new build
diff --git a/sources b/sources
index bee8165..3ec1e02 100755
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (postgresql-14.4.tar.bz2) = dd2f80248684e331d2ffb1e26cd2a285df1fb18710807a0c31aedabf917912ce9267f8ca26318e5371d916c6fe476f8a17886d82d3ff86a974e6f24c19a6aafb
-SHA512 (postgresql-14.4.tar.bz2.sha256) = f2f4e5dd260163099742fe8a0ee854d92af425ba52243e699df006ea7c98153961a0ec08f684f3bbdbcc731cafe81621d36a9aad6594c702b54c03e9bb74a7d0
+SHA512 (postgresql-15.4.tar.bz2) = 37dd3e8b644d10c4f55963e07344ff4b0079adbae60052306f230f15e4ef4662b89e84a63dacc87cbf926c80b186d064a391283dd16e29ab47f7acc8a9860d0b
+SHA512 (postgresql-15.4.tar.bz2.sha256) = 9b0a915c5c387deabd5816052f5229a52c18b22b4ad3105e46f84f1789c13e89f8e9b2dbe54a536d06cf64eb8fc9b435eba90e3ed173ca8fed2ce0f4bc109b8a