diff --git a/flake.nix b/flake.nix
index feb7d33..01533d7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,7 +17,7 @@
         packages.default = pkgs.hello;
 
         devShell = with pkgs; mkShell {
-          nativeBuildInputs = [ cargo cargo-outdated cargo-zigbuild clippy gcc protobuf rust-analyzer rustc rustfmt ];
+          nativeBuildInputs = [ cargo cargo-expand cargo-outdated cargo-zigbuild clippy gcc protobuf rust-analyzer rustc rustfmt ];
 
           RUST_SRC_PATH = "${pkgs.rust.packages.stable.rustPlatform.rustLibSrc}";
         };