diff --git a/pkgs/misc/screensavers/xlockmore/default.nix b/pkgs/misc/screensavers/xlockmore/default.nix
index b59ed85f6bc..17b22ce0723 100644
--- a/pkgs/misc/screensavers/xlockmore/default.nix
+++ b/pkgs/misc/screensavers/xlockmore/default.nix
@@ -2,11 +2,11 @@
 , libXdmcp, libXt }:
 
 stdenv.mkDerivation rec {
-  name = "xlockmore-5.65";
+  name = "xlockmore-5.66";
 
   src = fetchurl {
     url = "http://sillycycle.com/xlock/${name}.tar.xz";
-    sha256 = "0d4l8ibbvc62whlq8rrbvqr3011a7h21l9na93r579g0dfwdbh6d";
+    sha256 = "sha256-WXalw2YoKNFFIskOBvKN3PyOV3iP3gjri3pw6e87q3E=";
     curlOpts = "--user-agent 'Mozilla/5.0'";
   };