diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..8a2b8ab
--- /dev/null
+++ b/.envrc
@@ -0,0 +1,5 @@
+use nix
+
+# hack
+# https://github.com/direnv/direnv/issues/1345
+mkdir -p $TMPDIR
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..72a2f05
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,35 @@
+let
+  nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/tarball/nixos-25.05";
+
+  pkgs = import nixpkgs {
+    config = { };
+    overlays = [ ];
+  };
+
+  packages =
+    let
+      phpForRuntimeWithXDebug = (
+        pkgs.php82.buildEnv {
+          extensions = (
+            { enabled, all }:
+            enabled
+            ++ (with all; [
+              xdebug
+            ])
+          );
+        }
+      );
+    in
+    [
+      phpForRuntimeWithXDebug
+      pkgs.treefmt
+      pkgs.nixfmt-rfc-style
+      pkgs.gnumake
+      pkgs.php82Extensions.curl
+      pkgs.php82Packages.composer
+    ];
+in
+pkgs.mkShell {
+  inherit packages;
+}
+