diff --git a/shell.nix b/shell.nix
index caf094c..1f98f05 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,12 @@
 let 
-  pkgs = import <nixpkgs> {};
+  pkgs = import ((import <nixpkgs> {}).pkgs.fetchFromGitHub {
+    owner = "nixos";
+    repo = "nixpkgs-channels";
+    rev = "6715afca34f7ece882b82c2250a4f6dade42eac5"; # vimtex update
+    sha256 = "1ix8k5sm01i75wxnfrlwbmc8xs8dn5zna7jb4v387h8zy8a74d8m";
+  }) {};
 in pkgs.stdenv.mkDerivation { 
+
   name = "msc-thesis";
   buildInputs = [ 
     pkgs.pandoc