diff --git a/nix-os/core.nix b/nix-os/core.nix
index 1b4bb40..2eeee05 100644
--- a/nix-os/core.nix
+++ b/nix-os/core.nix
@@ -29,7 +29,8 @@ in
   ];
 
   # kernel
-  boot.kernelPackages = pkgs.linuxPackages_latest;
+  # FIXME: current cosmic-greeter (2024-12-02) fails to start with kernel 6.12
+  boot.kernelPackages = pkgs.linuxPackages_6_11;
 
   # Enable networking
   networking.networkmanager.enable = true;