diff --git a/postfix.spec b/postfix.spec
index 8fae092..462a0e5 100644
--- a/postfix.spec
+++ b/postfix.spec
@@ -56,8 +56,8 @@
 
 Name: postfix
 Summary: Postfix Mail Transport Agent
-Version: 3.8.3
-Release: 2%{?dist}
+Version: 3.8.4
+Release: 1%{?dist}
 Epoch: 2
 URL: http://www.postfix.org
 License: (IPL-1.0 OR EPL-2.0) AND GPL-2.0-or-later AND BSD-4-Clause-UC
@@ -836,6 +836,12 @@ fi
 %endif
 
 %changelog
+* Tue Jan  2 2024 Jaroslav Škarvada <jskarvad@redhat.com> - 2:3.8.4-1
+- New version
+  Resolves: rhbz#2255641
+- Fixed SMTP smuggling vulnerability
+  Resolves: CVE-2023-51764
+
 * Tue Dec 12 2023 Jaroslav Škarvada <jskarvad@redhat.com> - 2:3.8.3-2
 - Converted license tag to SPDX
 
diff --git a/sources b/sources
index 748ce3c..71a9a6a 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (postfix-3.8.3.tar.gz) = 38df222cd1fca992bba9eef123ed547386244f41577f0f4eec9c055afd48773736bd9d5857166e31d94e5c55be57a4381f8ce1c8cde80e9b8779bae5e0720aef
+SHA512 (postfix-3.8.4.tar.gz) = 5bae3d62e104714aead1fff28a595bab4315227382f53c8dae2a231f4240e31abda19c1e3befc1db4c89bc5d66c9a43830390365aadabdac5cf36b493c5c48c7
 SHA512 (pflogsumm-1.1.5.tar.gz) = 994d660692dfea38a1dd9866d15f15035657e85131c1f5a2cd82baa5bd4ad987a00939cb5233f316d2090014c52ae68ef20db0c893f8634969484e0e74678f4d