diff --git a/machines/common/shared/nix.nix b/machines/common/shared/nix.nix
index bea18ee..9d2e72f 100644
--- a/machines/common/shared/nix.nix
+++ b/machines/common/shared/nix.nix
@@ -12,7 +12,7 @@ in {
   nixpkgs.config.allowUnfree = true;
   nix = {
     gc.automatic = true;
-    package = pkgs.nixVersions.nix_2_17;
+    package = pkgs.nixVersions.nix_2_18;
     settings =
       {
         auto-optimise-store = true;
diff --git a/machines/lib.nix b/machines/lib.nix
index 540b7e8..f1cee3d 100644
--- a/machines/lib.nix
+++ b/machines/lib.nix
@@ -12,7 +12,7 @@
     config = {
       nixpkgs = {
         overlays = overlays;
-        config.permittedInsecurePackages = ["nix-2.17.1"];
+        config.permittedInsecurePackages = [];
       };
       home-manager = {
         backupFileExtension = "backup";