Overriding bazel version

Help
1

I’m trying to override bazel version in my flake but it still gives me the nixpkgs standard version. Any clue on what is going on or what I am doing wrong here?

#flake.nix
{
  description = "My Bazel 7.6.1 devshell";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
  };

  outputs =
    { self, nixpkgs, ... }@inputs:
    let
      system = "x86_64-linux";
      bazelVersion = "7.6.1";

      newDistHash = "sha256-wRBtuT64pxmm4uHpMn9BsAO21/fp0E8gYFeZB3Wndg4=";
      newBootstrapHash = "sha256-wRBtuT64pxmm4uHpMn9BsAO21/fp0E8gYFeZB3Wndg4=";

      myOverlay = final: prev: {
        bazel_7 = prev.bazel_7.overrideAttrs (old: rec {
          version = bazelVersion;

          src = prev.fetchurl {
            url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel-${version}-dist.zip";
            hash = newDistHash;
          };

          passthru = old.passthru // {
            bazelBootstrap = old.passthru.bazelBootstrap.overrideAttrs (boot: {
              version = bazelVersion;
              src = prev.fetchurl {
                url = "https://github.com/bazelbuild/bazel/releases/download/${version}/bazel_nojdk-${version}-linux-x86_64";
                hash = newBootstrapHash;
              };
            });
          };
        });
      };

      pkgs = import nixpkgs {
        inherit system;
        overlays = [ myOverlay ];
      };
    in
    {
      devShells.${system}.default = pkgs.mkShell {
        packages = [
          pkgs.bazel_7
        ];
      };
    };
}

Then in my shell:

$ nix develop
$ bazel version
bazel 7.4.1