diff --git a/flake.nix b/flake.nix
index ab010ff..32922c0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,6 +38,7 @@
             gdb
             bacon
             python313Packages.pygments # for personal gdb-dashboard use
+            cargo-expand
           ];
           shellHook = ''
             export SHELL=${pkgs.lib.getExe pkgs.bashInteractive}