Pin nixpkgs

1 files changed, 6 insertions, 1 deletions

diff --git a/shell.nix b/shell.nix
index 9058482..a34dfbc 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,9 @@
-with (import <nixpkgs> {});
+with (import (builtins.fetchGit {
+  name = "nixpkgs-20.03";
+  url = "git@github.com:nixos/nixpkgs.git";
+  rev = "5272327b81ed355bbed5659b8d303cf2979b6953";
+  ref = "refs/tags/20.03";
+}) {});
 
 haskell.lib.buildStackProject {
   name = "myenv";