diff --git a/nixpkgs.nix b/nixpkgs.nix
index 6a21dfbda..4492a1c3a 100644
--- a/nixpkgs.nix
+++ b/nixpkgs.nix
@@ -1,10 +1,8 @@
-{ nixpkgs ? import <nixpkgs>
-}:
-
-import ((nixpkgs {}).fetchFromGitHub {
-  owner = "NixOS";
-  repo = "nixpkgs";
-  rev = "a7a1447e5d40a9ad90983d33e151f5474eddeed9";
-  sha256 = "1zb8wgsq9grrsdcz81y08h45rj8i5r8ckjhg2cv1cqmam4dczcrf";
-  fetchSubmodules = true;
-})
+import (
+  let
+    lock = builtins.fromJSON (builtins.readFile ./flake.lock);
+  in fetchTarball {
+    url = "https://api.github.com/repos/NixOS/nixpkgs/tarball/${lock.nodes.nixpkgs.locked.rev}";
+    sha256 = lock.nodes.nixpkgs.locked.narHash;
+  }
+)
diff --git a/shell.nix b/shell.nix
index 701304db9..73dd7f849 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
-{ pkgs ? (import ./nixpkgs.nix {}).pkgs }:
+{ pkgs ? (import ./nixpkgs.nix).pkgs }:
 
 let
   haskellPackages = pkgs.haskellPackages;
diff --git a/stack.nix b/stack.nix
index 53fb60f6b..762fd7481 100644
--- a/stack.nix
+++ b/stack.nix
@@ -1,4 +1,4 @@
-{ ghc, nixpkgs ? import ./nixpkgs.nix {} }:
+{ ghc, nixpkgs ? import ./nixpkgs.nix }:
 
 let
   # haskellPackages = import ./stackage.nix { inherit nixpkgs; };
diff --git a/stackage.nix b/stackage.nix
index 0dfcdcae4..58a86fc86 100644
--- a/stackage.nix
+++ b/stackage.nix
@@ -1,4 +1,4 @@
-{ nixpkgs ? import ./nixpkgs.nix {}
+{ nixpkgs ? import ./nixpkgs.nix
 , snapshot ? "lts-13.21"
 }: