diff --git a/flake.nix b/flake.nix
index 03196b6..a05a145 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,8 +9,8 @@
       pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ (import mozilla-overlay) crosspkgs-overlay ]; };
       
       rustManifest = pkgs.fetchurl {
-        url = "https://static.rust-lang.org/dist/2024-09-05/channel-rust-nightly.toml";
-        sha256 = "sha256-3aoA7PuH09g8F+60uTUQhnHrb/ARDLueSOD08ZVsWe0=";
+        url = "https://static.rust-lang.org/dist/2024-07-19/channel-rust-nightly.toml";
+        sha256 = "sha256-MM2K43Kg+f83XQXT2lI7W/ZdQjLXhMUvA6eGtD+rqDY=";
       };
       rustTargets = [];
       rustChannelOfTargets = _channel: _date: targets:
@@ -104,9 +104,7 @@
         dontFixup = true;
       };
 
-      cargo-xbuild = pkgs.cargo-xbuild.overrideAttrs(oa: {
-        postPatch = "substituteInPlace src/sysroot.rs --replace 2021 2018";
-      });
+      cargo-xbuild = pkgs.cargo-xbuild;
 
       build-crate = name: crate: features: rustPlatform.buildRustPackage rec {
         name = "${crate}";
@@ -114,7 +112,12 @@
         src = builtins.filterSource (path: type:
           baseNameOf path != "target"
         ) ./.;
-        cargoLock = { lockFile = ./Cargo.lock; };
+        cargoLock = { 
+          lockFile = ./Cargo.lock; 
+          outputHashes = {
+            "fatfs-0.4.0" = "sha256-P7IgvhwTPXtNhcyv8cFqwO2UdaEcCGJY7UBG6+yBFSg=";
+          };
+        };
 
         nativeBuildInputs = [ cargo-xbuild llvmPackages_11.clang-unwrapped ];
         buildPhase = ''