diff --git a/flake.nix b/flake.nix
index dd4e46a..2f63aad 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,7 +25,7 @@
       in {
         devShell = pkgs.mkShell {
           CFLAGS="-I${pkgs.sqlite.dev}/include";
-          buildInputs = with pkgs; [ go gopls gotools go-tools golangci-lint sqlite];
+          buildInputs = with pkgs; [ go gopls gotools go-tools golangci-lint sqlite mercurial];
         };
 
         defaultPackage = pkgs.buildGoModule {