diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..a53683d
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1773122722,
+        "narHash": "sha256-FIqHByVqxCprNjor1NqF80F2QQoiiyqanNNefdlvOg4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "62dc67aa6a52b4364dd75994ec00b51fbf474e50",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 17fc0c1..6267bd1 100644
--- a/flake.nix
+++ b/flake.nix
@@ -12,10 +12,15 @@
       pkgs = import nixpkgs { inherit system; };
     in
     {
-      packages.${system}.hello-world = pkgs.callPackage ./packages/hello-world.nix { };
+      packages.${system} = rec {
+        hello-world = pkgs.callPackage ./packages/hello-world.nix { };
+        xonsh = pkgs.callPackage ./packages/xonsh.nix { };
+        default = hello-world;
+      };
 
       overlays.default = final: prev: {
         hello-world = final.callPackage ./packages/hello-world.nix { };
+        xonsh = final.callPackage ./packages/xonsh.nix { };
       };
 
       devShells.${system}.default = pkgs.mkShell {
diff --git a/packages/xonsh.nix b/packages/xonsh.nix
new file mode 100644
index 0000000..dcf90cc
--- /dev/null
+++ b/packages/xonsh.nix
@@ -0,0 +1,29 @@
+{ python3Packages }:
+
+python3Packages.buildPythonPackage rec {
+  pname = "xonsh";
+  version = "0.22.7";
+
+  src = python3Packages.fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-gPApjBEctw1eLWN5gtz0ArJXPOcSqwyBNJBHdFMdRwk=";
+  };
+
+  # xonsh uses pyproject.toml setuptools
+  format = "pyproject";
+  build-system = [ python3Packages.setuptools ];
+
+  propagatedBuildInputs = with python3Packages; [
+    ply
+    prompt-toolkit
+    pygments
+  ];
+
+  doCheck = false;
+
+  meta = {
+    description = "Python-powered shell that combines Python with shell features";
+    homepage = "https://xon.sh";
+    license = python3Packages.setuptools.meta.bsd3 or python3Packages.setuptools.meta.license;
+  };
+}