diff --git a/checks/flash/flake-module.nix b/checks/flash/flake-module.nix
index 17f98b2a8..da0dad4bf 100644
--- a/checks/flash/flake-module.nix
+++ b/checks/flash/flake-module.nix
@@ -46,6 +46,7 @@
         pkgs.buildPackages.xorg.lndir
         self.nixosConfigurations."test-flash-machine-${pkgs.hostPlatform.system}".pkgs.perlPackages.ConfigIniFiles
         self.nixosConfigurations."test-flash-machine-${pkgs.hostPlatform.system}".pkgs.perlPackages.FileSlurp
+        pkgs.bubblewrap
 
         self.nixosConfigurations."test-flash-machine-${pkgs.hostPlatform.system}".config.system.build.toplevel
         self.nixosConfigurations."test-flash-machine-${pkgs.hostPlatform.system}".config.system.build.diskoScript
@@ -74,7 +75,7 @@
               substituters = lib.mkForce [ ];
               hashed-mirrors = null;
               connect-timeout = lib.mkForce 3;
-              flake-registry = pkgs.writeText "flake-registry" ''{"flakes":[],"version":2}'';
+              flake-registry = "";
               experimental-features = [
                 "nix-command"
                 "flakes"
diff --git a/checks/update/flake-module.nix b/checks/update/flake-module.nix
index 65c56e971..50c197dbb 100644
--- a/checks/update/flake-module.nix
+++ b/checks/update/flake-module.nix
@@ -112,6 +112,7 @@
                     pkgs.stdenv.drvPath
                     pkgs.bash.drvPath
                     pkgs.buildPackages.xorg.lndir
+                    pkgs.bubblewrap
                     (import ../installation/facter-report.nix pkgs.hostPlatform.system)
                   ]
                   ++ builtins.map (i: i.outPath) (builtins.attrValues self.inputs);