diff --git a/gnu/packages/dns.scm b/gnu/packages/dns.scm
index e0197fca32..85b44fb6fb 100644
--- a/gnu/packages/dns.scm
+++ b/gnu/packages/dns.scm
@@ -5,7 +5,7 @@
 ;;; Copyright © 2016, 2017 Efraim Flashner <efraim@flashner.co.il>
 ;;; Copyright © 2016 John Darrington <jmd@gnu.org>
 ;;; Copyright © 2016 ng0 <ng0@we.make.ritual.n0.is>
-;;; Copyright © 2016, 2017 Tobias Geerinckx-Rice <me@tobias.gr>
+;;; Copyright © 2016, 2017, 2018 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2016 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2017 Vasile Dumitrascu <va511e@yahoo.com>
 ;;; Copyright © 2017 Gregor Giesen <giesen@zaehlwerk.net>
@@ -483,14 +483,14 @@ Extensions} (DNSSEC).")
 (define-public knot
   (package
     (name "knot")
-    (version "2.6.3")
+    (version "2.6.4")
     (source (origin
               (method url-fetch)
               (uri (string-append "https://secure.nic.cz/files/knot-dns/"
                                   name "-" version ".tar.xz"))
               (sha256
                (base32
-                "143pk2124liiq1r4ja1s579nbv3hm2scbbfbfclc2pw60r07mcig"))
+                "0siqfm6iibx5yfshw40wa2dvmh99bibda6bmj96mbkby0jskf38x"))
               (modules '((guix build utils)))
               (snippet
                '(begin