diff --git a/pkgs/data/themes/catppuccin-sddm-corners/default.nix b/pkgs/data/themes/catppuccin-sddm-corners/default.nix
index eca8bac5e498..fe2fa9b9fb77 100644
--- a/pkgs/data/themes/catppuccin-sddm-corners/default.nix
+++ b/pkgs/data/themes/catppuccin-sddm-corners/default.nix
@@ -1,6 +1,7 @@
 { lib
 , stdenvNoCC
 , fetchFromGitHub
+, unstableGitUpdater
 }:
 
 stdenvNoCC.mkDerivation {
@@ -26,6 +27,8 @@ stdenvNoCC.mkDerivation {
     runHook postInstall
   '';
 
+  passthru.updateScript = unstableGitUpdater { };
+
   meta = {
     description = "Soothing pastel theme for SDDM based on corners theme.";
     homepage = "https://github.com/khaneliman/sddm-catppuccin-corners";