diff --git a/nixpkgs.nix b/nixpkgs.nix
index 1d0131f12..375c84162 100644
--- a/nixpkgs.nix
+++ b/nixpkgs.nix
@@ -4,6 +4,7 @@
 import ((nixpkgs {}).fetchFromGitHub {
   owner = "NixOS";
   repo = "nixpkgs";
-  rev = "0d97ef510bdc9d66f1023f970be58fdab2eb87fa";
-  sha256 = "00lnna6097wzrlmwqk8bqayh4qd2gz61zcd4yh7amirqflz3z2ll";
+  rev = "bc00ecedfa709f4fa91d445dd76ecd792cb2c728";
+  sha256 = "0plhwb04srr4b0h7w8qlqi207a19szz2wqz6r4gmic856jlkchaa";
+  fetchSubmodules = true;
 })
diff --git a/shell.nix b/shell.nix
index 938439e64..6e0ec5107 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,7 +2,8 @@
 
 let
   inherit (nixpkgs {}) pkgs;
-  haskellPackages = import ./stackage.nix { inherit nixpkgs; };
+  # haskellPackages = import ./stackage.nix { inherit nixpkgs; };
+  haskellPackages = pkgs.haskellPackages;
 
   drv = haskellPackages.callPackage ./uniworx.nix {};
 
@@ -19,7 +20,7 @@ let
   '';
 
   override = oldAttrs: {
-    nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ nodejs-13_x postgresql openldap google-chrome exiftool memcached minio minio-client ]) ++ (with pkgs.haskellPackages; [ stack yesod-bin hlint cabal-install weeder profiteur ]);
+    nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ nodejs-14_x postgresql openldap google-chrome exiftool memcached minio minio-client ]) ++ (with pkgs.haskellPackages; [ stack yesod-bin hlint cabal-install weeder profiteur ]);
     shellHook = ''
       export PROMPT_INFO="${oldAttrs.name}"
 
diff --git a/stack.nix b/stack.nix
index 6e5260710..0885ab569 100644
--- a/stack.nix
+++ b/stack.nix
@@ -1,7 +1,8 @@
 { ghc, nixpkgs ? import ./nixpkgs.nix {} }:
 
 let
-  haskellPackages = import ./stackage.nix { inherit nixpkgs; };
+  # haskellPackages = import ./stackage.nix { inherit nixpkgs; };
+  haskellPackages = pkgs.haskellPackages;
   inherit (nixpkgs {}) pkgs;
 in pkgs.haskell.lib.buildStackProject {
   inherit ghc;
diff --git a/stack.yaml b/stack.yaml
index 2e8bca4d5..bedc224c5 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -4,6 +4,7 @@ nix:
   packages: []
   pure: false
   shell-file: ./stack.nix
+  add-gc-roots: true
 
 extra-package-dbs: []