diff --git a/pkgs/development/interpreters/mujs/default.nix b/pkgs/development/interpreters/mujs/default.nix
index 1c0db241c1c8..319e039f5c59 100644
--- a/pkgs/development/interpreters/mujs/default.nix
+++ b/pkgs/development/interpreters/mujs/default.nix
@@ -1,12 +1,18 @@
-{ lib, stdenv, fetchurl, fetchpatch, readline }:
+{ lib
+, stdenv
+, fetchurl
+, fetchpatch
+, readline
+, gitUpdater
+}:
 
 stdenv.mkDerivation rec {
   pname = "mujs";
-  version = "1.3.2";
+  version = "1.3.3";
 
   src = fetchurl {
-    url = "https://mujs.com/downloads/mujs-${version}.tar.xz";
-    sha256 = "sha256-SIZZP8aIsM3M0x5ey+Wv560b7iOqaeZnuHGv1d/GQMM=";
+    url = "https://mujs.com/downloads/mujs-${version}.tar.gz";
+    hash = "sha256-4sXuVBbf2iIwx6DLeJXfmpstWyBluxjn5k3sKnlqvhs=";
   };
 
   patches = lib.optionals stdenv.isDarwin [
@@ -23,6 +29,11 @@ stdenv.mkDerivation rec {
 
   makeFlags = [ "prefix=$(out)" ];
 
+  passthru.updateScript = gitUpdater {
+    # No nicer place to track releases
+    url = "git://git.ghostscript.com/mujs.git";
+  };
+
   meta = with lib; {
     homepage = "https://mujs.com/";
     description = "A lightweight, embeddable Javascript interpreter";