diff --git a/flake.lock b/flake.lock
index 3e87197..9191749 100644
--- a/flake.lock
+++ b/flake.lock
@@ -1,20 +1,5 @@
 {
   "nodes": {
-    "nix-filter": {
-      "locked": {
-        "lastModified": 1730207686,
-        "narHash": "sha256-SCHiL+1f7q9TAnxpasriP6fMarWE5H43t25F5/9e28I=",
-        "owner": "numtide",
-        "repo": "nix-filter",
-        "rev": "776e68c1d014c3adde193a18db9d738458cd2ba4",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "nix-filter",
-        "type": "github"
-      }
-    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1730958623,
@@ -33,7 +18,6 @@
     },
     "root": {
       "inputs": {
-        "nix-filter": "nix-filter",
         "nixpkgs": "nixpkgs"
       }
     }
diff --git a/flake.nix b/flake.nix
index cd5423d..4e676ed 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,16 +1,12 @@
 {
   description = "Check the forecast for today's Nix builds";
 
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    nix-filter.url = "github:numtide/nix-filter";
-  };
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
   outputs =
     {
       self,
       nixpkgs,
-      nix-filter,
     }:
     let
       inherit (nixpkgs) lib;
@@ -142,7 +138,7 @@
       );
 
       overlays.default = final: _: {
-        nix-forecast = final.callPackage ./nix/package.nix { inherit nix-filter self; };
+        nix-forecast = final.callPackage ./nix/package.nix { };
       };
     };
 }
diff --git a/nix/package.nix b/nix/package.nix
index e0f7b77..cc60573 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -5,26 +5,28 @@
   nix,
   rustPlatform,
   versionCheckHook,
-
-  nix-filter,
-  self,
 }:
 
+let
+  fs = lib.fileset;
+in
 rustPlatform.buildRustPackage rec {
   pname = "nix-forecast";
   inherit (passthru.cargoTOML.package) version;
 
-  src = nix-filter {
-    root = self;
-    include = [
-      "Cargo.toml"
-      "Cargo.lock"
-      "build.rs"
-      "src/"
-    ];
+  src = fs.toSource {
+    root = ../.;
+    fileset = fs.intersection (fs.gitTracked ../.) (
+      fs.unions [
+        ../Cargo.lock
+        ../Cargo.toml
+        ../build.rs
+        ../src
+      ]
+    );
   };
 
-  cargoLock.lockFile = self + "/Cargo.lock";
+  cargoLock.lockFile = ../Cargo.lock;
 
   nativeBuildInputs = [
     installShellFiles
@@ -48,7 +50,7 @@ rustPlatform.buildRustPackage rec {
   };
 
   passthru = {
-    cargoTOML = lib.importTOML (self + "/Cargo.toml");
+    cargoTOML = lib.importTOML ../Cargo.toml;
   };
 
   meta = {