diff --git a/README.md b/README.md
index b764881..bfdaf09 100644
--- a/README.md
+++ b/README.md
@@ -32,7 +32,6 @@ mostly wrappers that set common device tree settings for you.
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.11";
     raspberry-pi-nix = {
       url = "github:tstat/raspberry-pi-nix";
-      inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
diff --git a/flake.nix b/flake.nix
index 0e4fe7e..c4567b5 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,14 +1,11 @@
 {
   description = "raspberry-pi nixos configuration";
 
-  inputs = { nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.11"; };
+  inputs = { };
 
-  outputs = { self, nixpkgs }: {
+  outputs = { self }: {
     overlay = import ./overlay;
-    rpi = import ./rpi {
-      nixpkgs = nixpkgs;
-      overlay = self.overlay;
-    };
+    rpi = import ./rpi { overlay = self.overlay; };
     rpi-3b-plus = import ./rpi-3b-plus self.rpi;
     rpi-4b = import ./rpi-4b self.rpi;
     rpi-zero-2-w = import ./rpi-zero-2-w self.rpi;
diff --git a/rpi/default.nix b/rpi/default.nix
index 1df7e01..c2d0a24 100644
--- a/rpi/default.nix
+++ b/rpi/default.nix
@@ -1,9 +1,9 @@
-{ overlay, nixpkgs }:
+{ overlay }:
 { lib, pkgs, config, ... }:
 
 {
   imports = [
-    (import ../sd-image nixpkgs)
+    ../sd-image
     ./device-tree.nix
     ./audio.nix
     ./i2c.nix
diff --git a/sd-image/default.nix b/sd-image/default.nix
index 0977461..3ebb0da 100644
--- a/sd-image/default.nix
+++ b/sd-image/default.nix
@@ -1,8 +1,7 @@
-stable:
 { config, lib, pkgs, ... }:
 
 {
-  imports = [ (import ./sd-image.nix stable) ];
+  imports = [ ./sd-image.nix ];
 
   boot.loader.grub.enable = false;
   boot.loader.generic-extlinux-compatible.enable = true;
diff --git a/sd-image/sd-image.nix b/sd-image/sd-image.nix
index c3891cc..aeaa9e4 100644
--- a/sd-image/sd-image.nix
+++ b/sd-image/sd-image.nix
@@ -1,4 +1,3 @@
-nixpkgs:
 # This module was lifted from nixpkgs installer code. It is modified
 # so as to not import all-hardware. The goal here is to write the
 # nixos image for a raspberry pi to an sd-card in a way so that we can
@@ -18,12 +17,12 @@ nixpkgs:
 # The derivation for the SD image will be placed in
 # config.system.build.sdImage
 
-{ config, lib, pkgs, ... }:
+{ modulesPath, config, lib, pkgs, ... }:
 
 with lib;
 
 let
-  rootfsImage = pkgs.callPackage "${nixpkgs}/nixos/lib/make-ext4-fs.nix" ({
+  rootfsImage = pkgs.callPackage "${modulesPath}/../lib/make-ext4-fs.nix" ({
     inherit (config.sdImage) storePaths;
     compressImage = true;
     populateImageCommands = config.sdImage.populateRootCommands;