diff --git a/postfix-3.7.2.tar.gz b/postfix-3.7.2.tar.gz
deleted file mode 100644
index 3364ecc..0000000
Binary files a/postfix-3.7.2.tar.gz and /dev/null differ
diff --git a/postfix-3.7.4.tar.gz b/postfix-3.7.4.tar.gz
new file mode 100644
index 0000000..19d42cb
Binary files /dev/null and b/postfix-3.7.4.tar.gz differ
diff --git a/postfix.spec b/postfix.spec
index f37df0c..6cd47c5 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -22,12 +22,12 @@
 
 Name:           postfix
 Summary:        Postfix Mail Transport Agent
-Version:        3.7.2
-Release:        4
+Version:        3.7.4
+Release:        1
 Epoch:          2
 URL:            http://www.postfix.org
 License:        (IPL-1.0 and GPLv2+) or (EPL-2.0 and GPLv2+)
-Source0:        ftp://ftp.porcupine.org/mirrors/postfix-release/official/%{name}-%{version}.tar.gz
+Source0:        http://ftp.porcupine.org/mirrors/postfix-release/official/%{name}-%{version}.tar.gz
 Source1:        postfix-etc-init.d-postfix
 Source2:        postfix.service
 Source3:        postfix.aliasesdb
@@ -121,6 +121,9 @@ pushd pflogsumm-1.1.5
 %patch6 -p1 -b .ipv6-warnings-fix
 popd
 
+sed -i makedefs -e '\@Linux\.@s|345|3456|'
+sed -i src/util/sys_defs.h -e 's@defined(LINUX5)@defined(LINUX5) || defined(LINUX6)@'
+
 for f in README_FILES/TLS_{LEGACY_,}README TLS_ACKNOWLEDGEMENTS; do
         iconv -f iso8859-1 -t utf8 -o ${f}{_,} &&
                 touch -r ${f}{,_} && mv -f ${f}{_,}
@@ -555,6 +558,12 @@ fi
 %{postfix_doc_dir}/README_FILES/*
 
 %changelog
+* Sat Mar 11 2023 xinghe <xinghe2@h-partners.com> - 2:3.7.4-1
+- Type:requirements
+- ID:NA
+- SUG:NA
+- DESC:update postfix to 3.7.4
+
 * Fri Mar 10 2023 gaihuiying <eaglegai@163.com> - 2:3.7.2-4
 - Type:bugfix
 - ID:NA