diff --git a/flake.nix b/flake.nix
index a8907f0..681b3b6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,7 +14,7 @@
   };
 
   outputs = { self, flake-utils, nixpkgs, nix-pre-commit-hooks, poetry2nix }: {
-    overlay = import ./default.nix;
+    overlays.default = import ./default.nix;
 
     nixosModules =
       let
@@ -27,7 +27,7 @@
     let
       pkgs = import nixpkgs {
         inherit system;
-        overlays = [ self.overlay poetry2nix.overlay ]; # FIXME: remove poetry2nix when newer version is in nixpkgs
+        overlays = [ self.overlays.default poetry2nix.overlays.default ]; # FIXME: remove poetry2nix when newer version is in nixpkgs
         config.allowUnfree = true;
       };
       lib = pkgs.lib;
diff --git a/hcloud_exporter/default.nix b/hcloud_exporter/default.nix
index ee66811..269445f 100644
--- a/hcloud_exporter/default.nix
+++ b/hcloud_exporter/default.nix
@@ -11,7 +11,7 @@ buildGoModule rec {
     sha256 = "sha256-7UJhM/HLhRySTQ1lNLMgfKD9GDOivRMhGGNVLQknMLA=";
   };
 
-  vendorSha256 = "sha256-qWYj/BCuY/995pLiBUoMtKvDV81j17c2GJeqhgBWn74=";
+  vendorHash = "sha256-qWYj/BCuY/995pLiBUoMtKvDV81j17c2GJeqhgBWn74=";
 
   meta = with lib; {
     description = "Prometheus exporter for Hetzner Cloud";