diff --git a/nixos/tests/installed-tests/flatpak.nix b/nixos/tests/installed-tests/flatpak.nix
index 091c9932662..6b83d006f16 100644
--- a/nixos/tests/installed-tests/flatpak.nix
+++ b/nixos/tests/installed-tests/flatpak.nix
@@ -10,9 +10,9 @@ makeInstalledTest {
     services.xserver.displayManager.gdm.enable = false;
     services.gnome3.core-utilities.enable = false;
     services.flatpak.enable = true;
-    environment.systemPackages = with pkgs; [ gnupg ostree python2 ];
+    environment.systemPackages = with pkgs; [ gnupg ostree python3 ];
     virtualisation.memorySize = 2047;
-    virtualisation.diskSize = 1024;
+    virtualisation.diskSize = 3072;
   };
 
   testRunnerFlags = "--timeout 3600";