diff --git a/default.nix b/default.nix
index 319ecc866..55bb447a5 100644
--- a/default.nix
+++ b/default.nix
@@ -11,11 +11,6 @@ let
       ref = "nixos-20.03";
       rev = "afa9ca61924f05aacfe495a7ad0fd84709d236cc";
     }) {};
-    unstable = import (builtins.fetchGit {
-      url = "https://github.com/NixOS/nixpkgs-channels";
-      ref = "nixos-unstable";
-      rev = "dc80d7bc4a244120b3d766746c41c0d9c5f81dfa";
-    }) {};
     briefcase = import (builtins.path {
       path = ./.;
       name = "briefcase";
diff --git a/third_party/default.nix b/third_party/default.nix
index 8135d756e..949110373 100644
--- a/third_party/default.nix
+++ b/third_party/default.nix
@@ -1,5 +1,5 @@
-{ pkgs, unstable, briefcase, depot, ... }:
+{ pkgs, briefcase, depot, ... }:
 
 # Exposing these to be available as briefcase.third_party.pkgs for example.
 
-{ inherit pkgs unstable briefcase depot; }
+{ inherit pkgs briefcase depot; }