diff --git a/nix/backend.nix b/nix/backend.nix
index b2c031e..c4e0fe2 100644
--- a/nix/backend.nix
+++ b/nix/backend.nix
@@ -10,7 +10,9 @@ rustPlatform.buildRustPackage rec {
 
   src = ../.;
 
-  cargoHash = "sha256-NRrWWD3e2zm4rVYyCPm3vQhPDRkVMauTnoENwRucXcw=";
+  cargoLock = {
+    lockFile = ../Cargo.lock;
+  };
 
   meta = with lib; {
     platforms = lib.platforms.all;