diff --git a/nixos/system-tests.nix b/nixos/system-tests.nix
index 5f51d01dd57267b75b3742c76c03c1393676d426..ff37fc85a854f1780e65956da5a71825833f06f4 100644
--- a/nixos/system-tests.nix
+++ b/nixos/system-tests.nix
@@ -1,6 +1,6 @@
 # The overall system test suite for PrivateStorageio NixOS configuration.
 let
-  pkgs = import ../nixpkgs-ps.nix { };
+  pkgs = import ../nixpkgs-2105.nix { };
 in {
   private-storage = pkgs.nixosTest ./modules/tests/private-storage.nix;
   tahoe = pkgs.nixosTest ./modules/tests/tahoe.nix;