diff --git a/default.nix b/default.nix
index 03954f5..9be7eb3 100644
--- a/default.nix
+++ b/default.nix
@@ -2,7 +2,6 @@
   callPackage,
   fetchFromGitHub,
   git,
-  idris2,
   buildIdris,
   lib,
   installShellFiles,
diff --git a/flake.lock b/flake.lock
index b37df17..114656d 100644
--- a/flake.lock
+++ b/flake.lock
@@ -116,15 +116,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1704513904,
-        "narHash": "sha256-e+uXTIF5AGgIszIAZhF3vg+JBIwo9i407kUEFB+WxuM=",
+        "lastModified": 1704842529,
+        "narHash": "sha256-OTeQA+F8d/Evad33JMfuXC89VMetQbsU4qcaePchGr4=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "338a8dc6c108e5cae1e2d24dc131bdef4f6e24c1",
+        "rev": "eabe8d3eface69f5bb16c18f8662a702f50c20d5",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index a12505d..056c629 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,7 +2,7 @@
   description = "Harmony GitHub collaboration tool";
 
   inputs = {
-    nixpkgs.url = github:NixOS/nixpkgs;
+    nixpkgs.url = github:NixOS/nixpkgs/nixpkgs-unstable;
 
     idris.url = github:mattpolzin/Idris2/fix-install-output-buildIdris;
     idris.inputs.nixpkgs.follows = "nixpkgs";
@@ -11,6 +11,9 @@
     alejandra.inputs.nixpkgs.follows = "nixpkgs";
   };
 
+  # we grab Idris2 from nixpkgs unstable because it will already be built and cached.
+  # we use the idris2 compiler repo to grab the buildIdris function that isn't available
+  # in nixpkgs yet.
   outputs = {
     self,
     nixpkgs,
@@ -21,12 +24,13 @@
     forAllSystems = lib.genAttrs lib.systems.flakeExposed;
   in {
     packages = forAllSystems (
-      system: {
-        harmony = with nixpkgs.legacyPackages.${system};
-          callPackage ./default.nix {
-            idris2 = idris.packages.${system}.idris2;
-            buildIdris = idris.buildIdris.${system};
-          };
+      system: let
+        pkgs = nixpkgs.legacyPackages.${system};
+        buildIdris = idris.buildIdris.${system}.override {inherit (pkgs) idris2;};
+      in {
+        harmony = pkgs.callPackage ./default.nix {
+          inherit buildIdris;
+        };
 
         default = self.packages.${system}.harmony;
       }