diff --git a/flake.lock b/flake.lock
index 59f195c..4db24ea 100644
--- a/flake.lock
+++ b/flake.lock
@@ -64,9 +64,25 @@
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
+        "unstable": "unstable",
         "zig": "zig"
       }
     },
+    "unstable": {
+      "locked": {
+        "lastModified": 1659219666,
+        "narHash": "sha256-pzYr5fokQPHv7CmUXioOhhzDy/XyWOIXP4LZvv/T7Mk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7b9be38c7250b22d829ab6effdee90d5e40c6e5c",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
     "zig": {
       "inputs": {
         "flake-utils": "flake-utils_2",
diff --git a/flake.nix b/flake.nix
index 41b53ce..055be0a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,12 +4,14 @@
   inputs = {
     flake-utils.url = "github:numtide/flake-utils";
     zig.url = "github:arqv/zig-overlay";
+    unstable.url = "nixpkgs/nixos-unstable";
   };
 
-  outputs = { self, nixpkgs, zig, flake-utils }:
+  outputs = { self, nixpkgs, zig, flake-utils, unstable }:
     flake-utils.lib.eachDefaultSystem (system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
+        upkgs = unstable.legacyPackages.${system};
       in
       {
 
@@ -20,6 +22,8 @@
             pkgs.butler
             pkgs.binaryen
             pkgs.tiled
+            pkgs.libresprite
+            upkgs.ldtk
           ];
         };