diff --git a/pkgs/servers/x11/xorg/default.nix b/pkgs/servers/x11/xorg/default.nix
index 58a109e6739b..d4f12c2a0b80 100644
--- a/pkgs/servers/x11/xorg/default.nix
+++ b/pkgs/servers/x11/xorg/default.nix
@@ -638,11 +638,11 @@ lib.makeScope newScope (self: with self; {
   }) {};
 
   libSM = callPackage ({ stdenv, pkgconfig, fetchurl, libICE, libuuid, xorgproto, xtrans }: stdenv.mkDerivation {
-    name = "libSM-1.2.2";
+    name = "libSM-1.2.3";
     builder = ./builder.sh;
     src = fetchurl {
-      url = mirror://xorg/individual/lib/libSM-1.2.2.tar.bz2;
-      sha256 = "1gc7wavgs435g9qkp9jw4lhmaiq6ip9llv49f054ad6ryp4sib0b";
+      url = mirror://xorg/individual/lib/libSM-1.2.3.tar.bz2;
+      sha256 = "1fwwfq9v3sqmpzpscymswxn76xhxnysa24pfim1mcpxhvjcl89id";
     };
     hardeningDisable = [ "bindnow" "relro" ];
     nativeBuildInputs = [ pkgconfig ];
diff --git a/pkgs/servers/x11/xorg/tarballs.list b/pkgs/servers/x11/xorg/tarballs.list
index 0b5276c1345f..cd26da97a3a6 100644
--- a/pkgs/servers/x11/xorg/tarballs.list
+++ b/pkgs/servers/x11/xorg/tarballs.list
@@ -157,7 +157,7 @@ mirror://xorg/individual/lib/libfontenc-1.1.3.tar.bz2
 mirror://xorg/individual/lib/libFS-1.0.7.tar.bz2
 mirror://xorg/individual/lib/libICE-1.0.9.tar.bz2
 mirror://xorg/individual/lib/libpciaccess-0.14.tar.bz2
-mirror://xorg/individual/lib/libSM-1.2.2.tar.bz2
+mirror://xorg/individual/lib/libSM-1.2.3.tar.bz2
 mirror://xorg/individual/lib/libWindowsWM-1.0.1.tar.bz2
 mirror://xorg/individual/lib/libX11-1.6.7.tar.bz2
 mirror://xorg/individual/lib/libXau-1.0.8.tar.bz2