diff --git a/lib/fs.nix b/lib/fs.nix
index 8021d94..7e44d04 100644
--- a/lib/fs.nix
+++ b/lib/fs.nix
@@ -5,7 +5,7 @@
     path: let
       dirs = builtins.readDir path;
     in
-      builtins.filter (name: dirs.${name} == "directory") (builtins.attrNames dirs);
+      builtins.filter (type: dirs.${type} == "directory") (builtins.attrNames dirs);
 
   getModuleImports =
     path: let
diff --git a/modules/nixos/core/nix.nix b/modules/nixos/core/nix.nix
index 6b0d75f..c8c3342 100644
--- a/modules/nixos/core/nix.nix
+++ b/modules/nixos/core/nix.nix
@@ -1,6 +1,12 @@
-{ lib, ... }:
+{ lib, inputs, ... }:
 
-{
+let
+  importOverlays = builtins.map
+    (overlay: overlay { inherit lib inputs; })
+    (builtins.filter 
+      (file: builtins.match file "*.nix")
+      (lib.filesystem.listFilesRecursive ../../../overlays));
+in {
   nix = {
     settings = {
       auto-optimise-store = true;
@@ -18,5 +24,6 @@
       allowUnfree = true;
     };
     hostPlatform = lib.mkDefault "x86_64-linux";
+    overlays = importOverlays;
   };
 }
diff --git a/overlays/nixpkgs-unstable.nix b/overlays/nixpkgs-unstable.nix
new file mode 100644
index 0000000..1a0c1d6
--- /dev/null
+++ b/overlays/nixpkgs-unstable.nix
@@ -0,0 +1,4 @@
+{ inputs }:
+(final: prev: {
+  unstable = inputs.nixpkgs-unstable.legacyPackages.${prev.system};
+})