diff --git a/pkgs/applications/misc/koreader/default.nix b/pkgs/applications/misc/koreader/default.nix
index 471f3f04297e..f23e4c832493 100644
--- a/pkgs/applications/misc/koreader/default.nix
+++ b/pkgs/applications/misc/koreader/default.nix
@@ -13,12 +13,12 @@
 let font-droid = nerdfonts.override { fonts = [ "DroidSansMono" ]; };
 in stdenv.mkDerivation rec {
   pname = "koreader";
-  version = "2021.11";
+  version = "2021.12";
 
   src = fetchurl {
     url =
       "https://github.com/koreader/koreader/releases/download/v${version}/koreader-${version}-amd64.deb";
-    sha256 = "sha256-5DNC0MlLB+2JBV2TADSvO40rPlvsPehfv+YE/45P2MA=";
+    sha256 = "sha256-duOIbYavqmUUkH6RthTYu/SeM8zOeeLm7CIAQwhw6AY=";
   };
 
   sourceRoot = ".";