diff --git a/pkgs/servers/mail/mailman/default.nix b/pkgs/servers/mail/mailman/default.nix
index 933b0fabc4b7..b18ab016c441 100644
--- a/pkgs/servers/mail/mailman/default.nix
+++ b/pkgs/servers/mail/mailman/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, python, pythonPackages }:
 
 stdenv.mkDerivation rec {
-  name = "mailman-2.1.18";
+  name = "mailman-2.1.23";
 
   src = fetchurl {
     url = "mirror://gnu/mailman/${name}.tgz";
-    sha256 = "0jc360crakvpz71msl0h11zv3849fqzlj9jfh1g7x3j4459n07fw";
+    sha256 = "0s9ywix4m3n7qa0baws744ildg48hsa87jahpsfiqqilhmpwl8mh";
   };
 
   buildInputs = [ python pythonPackages.dns ];