diff --git a/README.md b/README.md
index 7ead936..e55fe79 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,10 @@
 # devkitnix
 
-Collection of devkitpro toolchains compatible with Nix.
-To install toolchain, use following:
+Collection of devkitPro toolchains using Nix.
+To install a toolchain, use following:
 
 ```
-git clone https://github.com/knarkzel/devkitnix
+git clone https://github.com/zig-homebrew/devkitnix
 cd devkitnix
 nix-build <toolchain>.nix
 ```
@@ -23,6 +23,6 @@ nix-build <toolchain>.nix
 - Wii
 - Wii U
 
-# devkitA64
+## devkitA64
 
 - Nintendo Switch
diff --git a/devkitA64.nix b/devkitA64.nix
index a402083..d0862b4 100644
--- a/devkitA64.nix
+++ b/devkitA64.nix
@@ -1,5 +1,5 @@
 let
-  pkgs = import <nixpkgs> {};
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e3583ad6e533a9d8dd78f90bfa93812d390ea187.tar.gz") {};
   image = pkgs.dockerTools.pullImage {
     imageName = "devkitpro/devkita64";
     imageDigest = "sha256:70db4c954eea43be5f1bc64c8882154126c99f47927ecb1e6b27fa18004fc961";
diff --git a/devkitARM.nix b/devkitARM.nix
index 30e4d2a..cf68e93 100644
--- a/devkitARM.nix
+++ b/devkitARM.nix
@@ -1,5 +1,5 @@
 let
-  pkgs = import <nixpkgs> {};
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e3583ad6e533a9d8dd78f90bfa93812d390ea187.tar.gz") {};
   image = pkgs.dockerTools.pullImage {
     imageName = "devkitpro/devkitarm";
     imageDigest = "sha256:695d1eb865ca4b908b1f5c4de777b9eef0f927680f0c0654b07721f1df908606";
diff --git a/devkitPPC.nix b/devkitPPC.nix
index 896bc3e..d3f2117 100644
--- a/devkitPPC.nix
+++ b/devkitPPC.nix
@@ -1,5 +1,5 @@
 let
-  pkgs = import <nixpkgs> {};
+  pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/e3583ad6e533a9d8dd78f90bfa93812d390ea187.tar.gz") {};
   image = pkgs.dockerTools.pullImage {
     imageName = "devkitpro/devkitppc";
     imageDigest = "sha256:d88e21c1a7b5f8070ba7a15aa892e395f118ded9803b0f8223a3d29ba279fff3";