diff --git a/flake.lock b/flake.lock
index 1d0edcc..7d91bc5 100644
--- a/flake.lock
+++ b/flake.lock
@@ -40,6 +40,22 @@
         "type": "github"
       }
     },
+    "master": {
+      "locked": {
+        "lastModified": 1649626569,
+        "narHash": "sha256-Zy6yK1GrB+NfvnumePfJDygs2jsmMlYn/ADF9CqcUQQ=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "5949b253ad1730633e2d4b848a688be24691096c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1649537291,
@@ -75,6 +91,7 @@
       "inputs": {
         "agenix": "agenix",
         "homemanager": "homemanager",
+        "master": "master",
         "nixpkgs": "nixpkgs",
         "nur": "nur",
         "unstable": "unstable"
diff --git a/flake.nix b/flake.nix
index c6793df..4be8296 100644
--- a/flake.nix
+++ b/flake.nix
@@ -6,6 +6,10 @@
       url = "github:nixos/nixpkgs/nixos-21.11";
     };
 
+    master = {
+      url = "github:nixos/nixpkgs/master";
+    };
+
     unstable = {
       url = "github:nixos/nixpkgs/nixos-unstable";
     };
@@ -27,6 +31,10 @@
 
   outputs = { self, nur, ... }@inputs:
     let
+      overlay-master = final: prev: {
+        master = inputs.master.legacyPackages.${prev.system};
+      };
+
       overlay-unstable = final: prev: {
         unstable = inputs.unstable.legacyPackages.${prev.system};
       };
@@ -69,6 +77,7 @@
           overlays = [
             self.overlay
             nur.overlay
+            overlay-master
             overlay-unstable
           ];
         };
diff --git a/machines/services/dyndns.nix b/machines/services/dyndns.nix
index 7345425..ba1b7e8 100644
--- a/machines/services/dyndns.nix
+++ b/machines/services/dyndns.nix
@@ -19,7 +19,7 @@ in
     services = {
       godns = {
         enable = true;
-        package = pkgs.unstable.godns;
+        package = pkgs.master.godns;
 
         settings = {
           provider = "Cloudflare";