diff --git a/pkgs/by-name/co/cosmic-wallpapers/package.nix b/pkgs/by-name/co/cosmic-wallpapers/package.nix
index bc861d7c0dde..ff2a28dad520 100644
--- a/pkgs/by-name/co/cosmic-wallpapers/package.nix
+++ b/pkgs/by-name/co/cosmic-wallpapers/package.nix
@@ -30,6 +30,8 @@ stdenvNoCC.mkDerivation (finalAttrs: {
 
   passthru.updateScript = nix-update-script {
     extraArgs = [
+      "--version"
+      "unstable"
       "--version-regex"
       "epoch-(.*)"
     ];