diff --git a/pkgs/applications/misc/calibre/default.nix b/pkgs/applications/misc/calibre/default.nix
index 48f55329d77..d902fe3ffa1 100644
--- a/pkgs/applications/misc/calibre/default.nix
+++ b/pkgs/applications/misc/calibre/default.nix
@@ -4,14 +4,14 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "calibre-0.8.50";
+  name = "calibre-0.8.51";
 
   src = fetchurl {
     urls = [ 
       "http://calibre-ebook.googlecode.com/files/${name}.tar.xz"
       "mirror://sourceforge/calibre/${name}.tar.xz"
     ];
-    sha256 = "0x6yazqjilh31rbd5knns1hag2visvp03jw5wm99lsyn9vz4qcbi";
+    sha256 = "1grcc0k9qpfpwp863x52rl9wj4wz61hcz67l8h2jmli0wxiq44z1";
   };
 
   inherit python;