diff --git a/postfix.spec b/postfix.spec
index d2a9519..43479cb 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -23,7 +23,7 @@
 Name:           postfix
 Summary:        Postfix Mail Transport Agent
 Version:        3.3.1
-Release:        19
+Release:        20
 Epoch:          2
 URL:            http://www.postfix.org
 License:        (IPL-1.0 and GPLv2+) or (EPL-2.0 and GPLv2+)
@@ -383,7 +383,7 @@ if [ ! -f %{sslcert} ]; then
     FQDN=localhost.localdomain
   fi
 
-  %{_bindir}/openssl req -new -key %{sslkey} -x509 -sha256 -days 365 -set_serial $RANDOM -out %{sslcert} \
+  %{_bindir}/openssl req -new -key %{sslkey} -x509 -sha256 -days 730 -set_serial $RANDOM -out %{sslcert} \
     -subj "/C=--/ST=SomeState/L=SomeCity/O=SomeOrganization/OU=SomeOrganizationalUnit/CN=${FQDN}/emailAddress=root@${FQDN}"
   chmod 644 %{sslcert}
 fi
@@ -557,6 +557,12 @@ fi
 %{postfix_doc_dir}/README_FILES/*
 
 %changelog
+* Fri Mar 10 2023 gaihuiying <eaglegai@163.com> - 2:3.3.1-20
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:modify Certificate validity period
+
 * Thu Mar 03 2022 gaihuiying <eaglegai@163.com> - 2:3.3.1-19
 - Type:bugfix
 - ID:NA