Example VM doesn't build

[laggron42]

I'm trying to run the example VM here, but I'm getting the following error when building. Any idea what's wrong?

$ nix run github:astro/microvm.nix#vm
evaluation warning: Using 'addressConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'addressConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'ipv6PrefixConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
evaluation warning: Using 'dhcpServerStaticLeaseConfig' is deprecated! Move all attributes inside one level up and remove it.
warning: download buffer is full; consider increasing the 'download-buffer-size' setting
error: hash mismatch in fixed-output derivation '/nix/store/syyawk1myb9bdw30a0h4gqd81jp9a2da-alioth-0.5.0-vendor-staging.drv':
         specified: sha256-J+1SXHQJJxT0qN/ELAvwQFnKCo13ZrQClpbfleM4PkA=
            got:    sha256-qR2eoh3jVCQmQhMqQINN7MqAzR+dIfuBa8lB4qcGoCw=
error: 1 dependencies of derivation '/nix/store/pr3ab7cak7sc0i1k94g0x2q9ibpgdm4f-alioth-0.5.0-vendor.drv' failed to build
error: 1 dependencies of derivation '/nix/store/9hn8j3v3y87jg5zw1a4yah2gc5sc3hx4-alioth-0.5.0.drv' failed to build
error: 1 dependencies of derivation '/nix/store/9ls2jqrxswbk10h3slk1da1cpbd9pn6i-microvm-alioth-microvm-microvm-run.drv' failed to build
error: 1 dependencies of derivation '/nix/store/x17b5q2qw4gm1bi6l86v8phjhmam72if-microvm-alioth-alioth-microvm.drv' failed to build
error: 1 dependencies of derivation '/nix/store/ia6li7qd1wv14xxv1yvnziy8iw1k6hb3-unit-script-install-microvm-alioth-start.drv' failed to build
error: 1 dependencies of derivation '/nix/store/93hv393lkginkp418v1ps5hn3rmin5r8-unit-install-microvm-alioth.service.drv' failed to build
error: 1 dependencies of derivation '/nix/store/3pk1g65rmb9iqrxb2imj5pf4nrxp5xpn-system-units.drv' failed to build
error: 1 dependencies of derivation '/nix/store/6kjknqslxz75i0nh2fqv03qg545rh6vy-etc.drv' failed to build
error: 1 dependencies of derivation '/nix/store/lci0qlz3s8brwjz362cv6cp2rqibnaja-nixos-system-microvms-host-25.05.20250501.f02fddb.drv' failed to build
error: 1 dependencies of derivation '/nix/store/52c91ivcyvvij2xsdf3ai684qp75rfp0-runtime-deps.drv' failed to build
error: 1 dependencies of derivation '/nix/store/2rygi8kk8nsczi758fk7g71vdhrhzckz-microvm-store-disk.erofs.drv' failed to build
error: 1 dependencies of derivation '/nix/store/g387b83qsasz48r011gk9392259rn2zc-microvm-microvms-host-microvm-run.drv' failed to build
error: 1 dependencies of derivation '/nix/store/r6q6122zlvpmyh2yfhyssdvis2x0fha0-microvm-qemu-microvms-host.drv' failed to build

Output of nix-info -m

• system: "x86_64-linux"
• host os: Linux 6.6.88, NixOS, 24.11 (Vicuna), 24.11.20250502.bf3287d
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.24.14
• nixpkgs: /nix/store/f2rpl7fcvv9r0rbbdhwcisr98s5925a5-source