diff --git a/default.nix b/default.nix
index c2deb40..bd64eb6 100644
--- a/default.nix
+++ b/default.nix
@@ -6,8 +6,9 @@
 , src ? ./.
 }:
 let
-  filteredSrc = src; # flake only includeds filed tracked by git builtins.filterSource pkgs.lib.cleanSourceFilter src;
-  crate2nix_tools = import "${fetchGit { url = "https://github.com/kolloch/crate2nix.git"; rev = "9f3f42bfecebbc3be5526a4194c82fdfc53269e9"; }}/tools.nix" { inherit pkgs; };
+  filteredSrc = src; # flake only includeds files tracked by git builtins.filterSource pkgs.lib.cleanSourceFilter src;
+  crate2nix = fetchGit { url = "https://github.com/kolloch/crate2nix.git"; rev = "2f861db71475b4cf0d266b8d2fd625cccf1e331b"; };
+  crate2nix_tools = (if builtins.compareVersions pkgs.crate2nix.version "0.8.0" == 1 then import (pkgs.crate2nix.src + "/tools.nix") else import "${crate2nix}/tools.nix") { inherit pkgs; };
   overrides = with pkgs; let
     clang = llvmPackages_10.clang;
     libclang = llvmPackages_10.libclang;
@@ -19,7 +20,7 @@ let
       LIBCLANG_PATH = "${libclang}/lib";
     };
     brownpaper = attrs: {
-      buildInputs = [ gmp ];
+      buildInputs = [ gmp (pkgs.callPackage "${crate2nix}/crate2nix/Cargo.nix" { strictDeprecation = true; }) ];
     };
   };
   client = with pkgs; runCommandLocal "brownpaper" {