diff --git a/flake.lock b/flake.lock
index 29b0e36..04a009f 100644
--- a/flake.lock
+++ b/flake.lock
@@ -267,6 +267,21 @@
         "type": "github"
       }
     },
+    "nixpkgs-master": {
+      "locked": {
+        "lastModified": 1656851669,
+        "narHash": "sha256-PA3tWTz372vExgjxvbHV2xdCFOJx3XHcR77/kPF8jbA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9cd6911860e620e45da58b098703876d950f4e38",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "master",
+        "type": "indirect"
+      }
+    },
     "nixpkgs_2": {
       "locked": {
         "lastModified": 1648219316,
@@ -482,6 +497,7 @@
         "home-manager": "home-manager",
         "mara": "mara",
         "nixpkgs": "nixpkgs_5",
+        "nixpkgs-master": "nixpkgs-master",
         "printerfacts": "printerfacts",
         "rhea": "rhea",
         "utils": "utils_4",
diff --git a/flake.nix b/flake.nix
index a3675d1..a0b0d6a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -8,6 +8,7 @@
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     utils.url = "github:numtide/flake-utils";
     emacs-overlay.url = "github:nix-community/emacs-overlay";
+    nixpkgs-master.url = "nixpkgs/master";
 
     wsl = {
       url = "github:nix-community/NixOS-WSL";
@@ -43,9 +44,10 @@
   };
 
   outputs = { self, nixpkgs, deploy-rs, home-manager, agenix, printerfacts, mara
-    , rhea, waifud, emacs-overlay, wsl, x, ... }:
+    , rhea, waifud, emacs-overlay, wsl, x, nixpkgs-master, ... }:
     let
       pkgs = nixpkgs.legacyPackages."x86_64-linux";
+      pkgsMaster = nixpkgs-master.legacyPackages."x86_64-linux";
 
       mkSystem = extraModules:
         nixpkgs.lib.nixosSystem rec {
@@ -61,7 +63,9 @@
 
               home-manager.useGlobalPkgs = true;
               home-manager.useUserPackages = true;
-              nixpkgs.overlays = [ emacs-overlay.overlay ];
+              nixpkgs.overlays = [
+                emacs-overlay.overlay
+              ];
             })
             ./common
 
@@ -77,6 +81,7 @@
         buildInputs = [
           deploy-rs.packages.x86_64-linux.deploy-rs
           agenix.packages.x86_64-linux.agenix
+          pkgsMaster.vim
         ];
       };