diff --git a/configuration.nix b/configuration.nix
index d4782a5..00925ce 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -92,6 +92,7 @@
     package = pkgs.xppen_4.overrideAttrs (old: {
       src = pkgs.fetchurl {
         url = "https://download01.xp-pen.com/file/2026/04/XPPenLinux4.0.15-260422.tar.gz";
+        hash = "sha256-Jady+pbqnzmVMuM0Io4/aE5B7dqNlDKPsnRj/Fbln6U=";
       };
     });
   };