diff --git a/pkgs/applications/editors/emacs-modes/quack/default.nix b/pkgs/applications/editors/emacs-modes/quack/default.nix
index c0ba183697e..317f121f364 100644
--- a/pkgs/applications/editors/emacs-modes/quack/default.nix
+++ b/pkgs/applications/editors/emacs-modes/quack/default.nix
@@ -1,12 +1,12 @@
 { fetchurl, stdenv, emacs }:
 
 stdenv.mkDerivation {
-  name = "quack-0.37";
+  name = "quack-0.39";
 
   src = fetchurl {
     # XXX: Upstream URL is not versioned, which might eventually break this.
     url = "http://www.neilvandyke.org/quack/quack.el";
-    sha256 = "1q5442cpvw2i0qhmhn7mh45jnmzg0cmd01k5zp4gvg1526c0hbcc";
+    sha256 = "1w3p03f1f3l2nldxc7dig1kkgbbvy5j7zid0cfmkcrpp1qrcsqic";
   };
 
   buildInputs = [ emacs ];