diff --git a/default.nix b/default.nix
index ab1e81a0..c98752f0 100644
--- a/default.nix
+++ b/default.nix
@@ -6,23 +6,21 @@
 pimalaya.mkDefault (
   {
     src = ./.;
-    version = "1.0.0";
+    version = "1.1.0";
     mkPackage = (
       {
         lib,
         pkgs,
-        rustPlatform,
         defaultFeatures,
         features,
+        ...
       }:
-      pkgs.callPackage ./package.nix {
-        inherit lib rustPlatform;
-        apple-sdk = pkgs.apple-sdk;
+      pkgs.himalaya.overrideAttrs (_: {
         installShellCompletions = false;
         installManPages = false;
         buildNoDefaultFeatures = !defaultFeatures;
         buildFeatures = lib.splitString "," features;
-      }
+      })
     );
   }
   // removeAttrs args [ "pimalaya" ]
diff --git a/package.nix b/package.nix
deleted file mode 100644
index 92eb3002..00000000
--- a/package.nix
+++ /dev/null
@@ -1,89 +0,0 @@
-# TODO: move this to nixpkgs
-# This file aims to be a replacement for the nixpkgs derivation.
-
-{
-  lib,
-  pkg-config,
-  rustPlatform,
-  fetchFromGitHub,
-  stdenv,
-  apple-sdk,
-  installShellFiles,
-  installShellCompletions ? stdenv.buildPlatform.canExecute stdenv.hostPlatform,
-  installManPages ? stdenv.buildPlatform.canExecute stdenv.hostPlatform,
-  notmuch,
-  gpgme,
-  buildNoDefaultFeatures ? false,
-  buildFeatures ? [ ],
-}:
-
-let
-  version = "1.0.0-beta.4";
-  hash = "sha256-NrWBg0sjaz/uLsNs8/T4MkUgHOUvAWRix1O5usKsw6o=";
-  cargoHash = "sha256-YS8IamapvmdrOPptQh2Ef9Yold0IK1XIeGs0kDIQ5b8=";
-in
-
-rustPlatform.buildRustPackage rec {
-  inherit cargoHash version;
-  inherit buildNoDefaultFeatures buildFeatures;
-
-  pname = "himalaya";
-
-  src = fetchFromGitHub {
-    inherit hash;
-    owner = "pimalaya";
-    repo = "himalaya";
-    rev = "v${version}";
-  };
-
-  nativeBuildInputs = [
-    pkg-config
-  ] ++ lib.optional (installManPages || installShellCompletions) installShellFiles;
-
-  buildInputs =
-    [ ]
-    ++ lib.optional stdenv.hostPlatform.isDarwin apple-sdk
-    ++ lib.optional (builtins.elem "notmuch" buildFeatures) notmuch
-    ++ lib.optional (builtins.elem "pgp-gpg" buildFeatures) gpgme;
-
-  doCheck = false;
-  auditable = false;
-
-  # unit tests only
-  cargoTestFlags = [ "--lib" ];
-
-  postInstall =
-    ''
-      mkdir -p $out/share/{applications,completions,man}
-      cp assets/himalaya.desktop "$out"/share/applications/
-    ''
-    + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
-      "$out"/bin/himalaya man "$out"/share/man
-    ''
-    + lib.optionalString installManPages ''
-      installManPage "$out"/share/man/*
-    ''
-    + lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
-      "$out"/bin/himalaya completion bash > "$out"/share/completions/himalaya.bash
-      "$out"/bin/himalaya completion elvish > "$out"/share/completions/himalaya.elvish
-      "$out"/bin/himalaya completion fish > "$out"/share/completions/himalaya.fish
-      "$out"/bin/himalaya completion powershell > "$out"/share/completions/himalaya.powershell
-      "$out"/bin/himalaya completion zsh > "$out"/share/completions/himalaya.zsh
-    ''
-    + lib.optionalString installShellCompletions ''
-      installShellCompletion "$out"/share/completions/himalaya.{bash,fish,zsh}
-    '';
-
-  meta = rec {
-    description = "CLI to manage emails";
-    mainProgram = "himalaya";
-    homepage = "https://github.com/pimalaya/himalaya";
-    changelog = "${homepage}/blob/v${version}/CHANGELOG.md";
-    license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [
-      soywod
-      toastal
-      yanganto
-    ];
-  };
-}