diff --git a/shell.nix b/shell.nix
index 145f7115..db301abf 100644
--- a/shell.nix
+++ b/shell.nix
@@ -3,6 +3,19 @@
 with pkgs;
 
 let inherit (lib) ;
+  mach-nix = import (builtins.fetchGit {
+    url = "https://github.com/DavHau/mach-nix";
+    ref = "master";
+  }) {
+    python = "python3";
+  };
+  zephyr-requirements = fetchurl {
+    url = "https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/v2.5.0/scripts/requirements-base.txt";
+    sha256 = "919a78ba9457a8e55451450329158ff7fdcbc4a2ddb0dd76ea804c3b04a3c6c6";
+  };
+  python-pkgs = mach-nix.mkPython rec {
+    requirements = builtins.readFile zephyr-requirements;
+  };
 in mkShell {
   buildInputs = [
     cmake
@@ -11,9 +24,7 @@ in mkShell {
     dtc
     dfu-util
     gcc-arm-embedded
-    python3
-    python38Packages.west
-    python38Packages.pip
+    python-pkgs
   ];
 
   shellHook = ''