diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..1d953f4
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use nix
diff --git a/pyproject.toml b/pyproject.toml
index b8ad7e2..0914385 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -3,5 +3,5 @@
 line-length = 100
 skip-string-normalization = true
 # default is per-file auto-detection
-target-version = ['py38']
-include = '\.py$'
\ No newline at end of file
+target-version = ['py313']
+include = '\.py$'
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..1a02f86
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,13 @@
+# https://github.com/NixOS/nixpkgs/issues/205072
+{ pkgs ? import <nixpkgs> { } }:
+
+let
+  pythonEnv = pkgs.python3.withPackages (ps: with ps; [ websockify ]);
+in
+pkgs.mkShell {
+  packages = [
+    pythonEnv
+    pkgs.openldap
+    pkgs.cyrus_sasl
+  ];
+}