diff --git a/shell.nix b/shell.nix
index e34f20c8..f36dc2e2 100644
--- a/shell.nix
+++ b/shell.nix
@@ -9,8 +9,12 @@ let inherit (lib) ;
   }) {
     python = "python3";
   };
+  zephyr-requirements = fetchurl {
+    url = "https://raw.githubusercontent.com/zephyrproject-rtos/zephyr/v2.5.0/scripts/requirements-base.txt";
+    sha256 = "919a78ba9457a8e55451450329158ff7fdcbc4a2ddb0dd76ea804c3b04a3c6c6";
+  };
   machNix = mach-nix.mkPython rec {
-    requirements = builtins.readFile ./zephyr/scripts/requirements-base.txt;
+    requirements = builtins.readFile zephyr-requirements;
   };
 in mkShell {
   buildInputs = [