diff --git a/pkgs/by-name/po/postfix/package.nix b/pkgs/by-name/po/postfix/package.nix
index 0e10ca91a12f..9ce23548cad4 100644
--- a/pkgs/by-name/po/postfix/package.nix
+++ b/pkgs/by-name/po/postfix/package.nix
@@ -78,11 +78,11 @@ let
 in
 stdenv.mkDerivation (finalAttrs: {
   pname = "postfix";
-  version = "3.11.4";
+  version = "3.11.5";
 
   src = fetchurl {
     url = "http://ftp.porcupine.org/mirrors/postfix-release/official/postfix-${finalAttrs.version}.tar.gz";
-    hash = "sha256-Im7FmhjkPid2kQBeMUlvdgi5upIQvmAKJn+yF6Smzuk=";
+    hash = "sha256-Smqz0Ok5CYn6IB/GxEYEX8cCxOFueiR8OuJhyem+5hA=";
   };
 
   nativeBuildInputs = [