diff --git a/haga.cabal b/haga.cabal
index 9742e2c..a162acb 100644
--- a/haga.cabal
+++ b/haga.cabal
@@ -15,7 +15,7 @@ license:             GPL-3.0-only
 license-file:        LICENSE
 author:              David Pätzel
 maintainer:          david.paetzel@posteo.de
-copyright:           Copyright (c): 2019 David Pätzel
+copyright:           Copyright (c): 2020 David Pätzel
 category:            Optimization
 build-type:          Simple
 
diff --git a/release.nix b/release.nix
index 8b5f56e..5285d93 100644
--- a/release.nix
+++ b/release.nix
@@ -14,6 +14,9 @@ let
       };
     };
   };
-  # pkgs = import <nixpkgs> { inherit config; };
-  pkgs = import /home/david/Code/nixpkgs/default.nix { inherit config; };
+  pkgs = import (builtins.fetchGit {
+    name = "nixpkgs-2020-05-13";
+    url = "https://github.com/NixOS/nixpkgs/";
+    rev = "a29c7741a3257f9e27daf126e18f472102eaa14b";
+  }) { inherit config; };
 in { haga = pkgs.haskellPackages.haga; }