diff --git a/flake.nix b/flake.nix
index 7f5a6c0..7e4978d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,16 +13,17 @@
       let
         pkgs = import nixpkgs { inherit system; };
         naersk-lib = pkgs.callPackage naersk { };
-      in
-      {
-        packages.default = naersk-lib.buildPackage {
-            buildInputs = with pkgs; [ gnupg ssh-copy-id ];
-            src = ./.;
-        };
+
+      in {
+        packages.default = pkgs.callPackage ./package.nix { inherit naersk-lib; };
         devShell = with pkgs; mkShell {
           buildInputs = [ cargo rustc rustfmt pre-commit rustPackages.clippy ];
           RUST_SRC_PATH = rustPlatform.rustLibSrc;
         };
       }
-    );
+    ) // {
+      overlays.default = final: prev: {
+        gpg-ssh = final.callPackage ./package.nix { naersk-lib = (final.callPackage naersk { }); };
+      };
+    };
 }
diff --git a/package.nix b/package.nix
new file mode 100644
index 0000000..32897c0
--- /dev/null
+++ b/package.nix
@@ -0,0 +1,8 @@
+{ naersk-lib
+, gnupg
+, ssh-copy-id
+}:
+naersk-lib.buildPackage {
+  buildInputs = [ gnupg ssh-copy-id ];
+  src = ./.;
+}