diff --git a/flake.nix b/flake.nix
index 45541f7..da68f66 100755
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Initialization flake";
 
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-23.11";
     nix-vscode-extensions.url = "github:nix-community/nix-vscode-extensions";
 
     alacritty-themes.url = "github:rajasegar/alacritty-themes";
@@ -22,7 +22,10 @@
         inputs.lanzaboote.nixosModules.lanzaboote
         {
           nix.settings.experimental-features = [ "nix-command" "flakes" ];
-          system.stateVersion = "23.05";
+          system.stateVersion = "23.11";
+          nixpkgs.config.permittedInsecurePackages = [
+            "mailspring-1.12.0"
+          ];
         }
       ] ++ (nixpkgs.lib.pipe ./modules [
         (import ./utils/nixFilesIn.nix nixpkgs.lib)