diff --git a/.envrc b/.envrc
index 1d953f4..90dc0e5 100644
--- a/.envrc
+++ b/.envrc
@@ -1 +1,2 @@
+export NIX_USER_CONF_FILES=$PWD/nix/nix.conf
 use nix
diff --git a/nix/nix.conf b/nix/nix.conf
new file mode 100644
index 0000000..c359816
--- /dev/null
+++ b/nix/nix.conf
@@ -0,0 +1,2 @@
+substituters = https://cache.nixos.org https://nix-community.cachix.org/ https://nixpkgs-update.cachix.org/
+trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs= nixpkgs-update.cachix.org-1:6y6Z2JdoL3APdu6/+Iy8eZX2ajf09e4EE9SnxSML1W8=