diff --git a/INSTALL-NIX.md b/INSTALL-NIX.md
index 3ff0e6d4..6dfaf00c 100644
--- a/INSTALL-NIX.md
+++ b/INSTALL-NIX.md
@@ -20,8 +20,6 @@ ctrl-d
 
 shell.nix script provided, all you need to do to setup the environment is to run `nix-shell` on the folder. 
 
-*Note*: nix-shell depends on the nix channel version, to force it to 19.03 (if you're on a different one) use `nix-shell -I nixpkgs=https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.03.tar.gz`
-
 # Installation
 
 ## Install node modules
diff --git a/new-lamassu-admin/shell.nix b/new-lamassu-admin/shell.nix
index 55cbc850..194f721e 100644
--- a/new-lamassu-admin/shell.nix
+++ b/new-lamassu-admin/shell.nix
@@ -1,9 +1,12 @@
-with import <nixpkgs> {};
+with import (fetchTarball {
+  url = https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.09.tar.gz;
+  sha256 = "1msjm4kx1z73v444i1iybvmc7z0kfkbn9nzr21rn5yc4ql1jwf99";
+}) {};
 
 stdenv.mkDerivation {
     name = "node";
     buildInputs = [
-	nodejs-10_x
+        nodejs-12_x
     ];
     shellHook = ''
         export PATH="$PWD/node_modules/.bin/:$PATH"
diff --git a/shell.nix b/shell.nix
index a00c92cf..4901f8e5 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,7 @@
-with import <nixpkgs> {};
+with import (fetchTarball {
+  url = https://github.com/NixOS/nixpkgs-channels/archive/nixos-19.03.tar.gz;
+  sha256 = "1niknqpb6yrlcvv28cylklf7kgkjslx87jqjcnbsnr89bsq618gn";
+}) {};
 
 stdenv.mkDerivation {
     name = "node";