diff --git a/deployment/check/data-model-tf/default.nix b/deployment/check/data-model-tf/default.nix
index 2ea10769..8361293e 100644
--- a/deployment/check/data-model-tf/default.nix
+++ b/deployment/check/data-model-tf/default.nix
@@ -6,7 +6,9 @@
 
 let
   overlay = _: prev: {
-    terraform-backend = prev.callPackage ../../modules/terraform-backend/package.nix { };
+    terraform-backend =
+      prev.callPackage "${sources.nixpkgs-unstable}/pkgs/by-name/te/terraform-backend/package.nix"
+        { };
     # FIXME centralize overlays
     # XXX using recent revision for https://github.com/NixOS/nixpkgs/pull/447849
     opentofu =
diff --git a/deployment/modules/terraform-backend/package.nix b/deployment/modules/terraform-backend/package.nix
deleted file mode 100644
index 58d73d92..00000000
--- a/deployment/modules/terraform-backend/package.nix
+++ /dev/null
@@ -1,32 +0,0 @@
-{
-  lib,
-  buildGoModule,
-  fetchFromGitHub,
-}:
-
-# FIXME upstream: https://github.com/NixOS/nixpkgs/pull/447753
-buildGoModule rec {
-  pname = "terraform-backend";
-  version = "0.1.3";
-
-  src = fetchFromGitHub {
-    owner = "nimbolus";
-    repo = "terraform-backend";
-    tag = "v${version}";
-    hash = "sha256-S3ih7dLSQs3xJMHyQyWy43OG1maizBPVT8IsrWcSRUM=";
-  };
-
-  vendorHash = "sha256-5L8MNhjEPI3OOmtHdkB9ZQp02d7nzPp5h0/gVHTiCws=";
-
-  ldflags = [
-    "-s"
-    "-w"
-  ];
-
-  meta = {
-    description = "State backend server which implements the Terraform HTTP backend API with pluggable modules for authentication, storage, locking and state encryption";
-    homepage = "https://github.com/nimbolus/terraform-backend";
-    license = lib.licenses.bsd3;
-    mainProgram = "cmd";
-  };
-}
diff --git a/npins/sources.json b/npins/sources.json
index c23f4a34..35452a17 100644
--- a/npins/sources.json
+++ b/npins/sources.json
@@ -189,9 +189,9 @@
       },
       "branch": "nixpkgs-unstable",
       "submodules": false,
-      "revision": "d7f52a7a640bc54c7bb414cca603835bf8dd4b10",
-      "url": "https://github.com/nixos/nixpkgs/archive/d7f52a7a640bc54c7bb414cca603835bf8dd4b10.tar.gz",
-      "hash": "0c9kjncpmbdx6gwww9fn81hyr3bngi4hg51g4n2q4808c321kf4j"
+      "revision": "2dad7af78a183b6c486702c18af8a9544f298377",
+      "url": "https://github.com/nixos/nixpkgs/archive/2dad7af78a183b6c486702c18af8a9544f298377.tar.gz",
+      "hash": "12icrzyc8h6yh5c60wdhaypzc17ygwz664h92jj112pf6whgi2id"
     },
     "proxmox-nixos": {
       "type": "Git",