diff --git a/README.md b/README.md
index bd11b3b..a2b6754 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,10 @@ Nix. It's installing a VM using the native virtualization
 VirtualBox. The project also comes with an installation script that configures
 Nix to use the VM as a remote builder automatically.
 
+## Requirements
+
+This project depends on Nix and a nixpkgs channel >= 18.03.
+
 ## Installation
 
 Fetch it from the NixOS binary cache:
diff --git a/overlay.nix b/overlay.nix
index 23e3758..b4ba07c 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -19,7 +19,7 @@ self: super: {
   nix-script-store-plugin = self.stdenv.mkDerivation {
     name = "nix-script-store-plugin";
     nativeBuildInputs = [ self.pkgconfig self.cmake ];
-    buildInputs = [ self.nixUnstable ];
+    buildInputs = [ self.nix ];
     src = self.fetchFromGitHub {
       owner = "puffnfresh";
       repo = "nix-script-store-plugin";
@@ -27,15 +27,4 @@ self: super: {
       sha256 = "0b1jbnw9hl99cqcqyv0szxs1mhvxzp91gy65194yyfhrdj5rx19m";
     };
   };
-
-  nixUnstable = self.nix.overrideDerivation (drv: {
-    name = "nix-2.0pre6018_g088ef817";
-    src = self.fetchFromGitHub {
-      owner = "NixOS";
-      repo = "nix";
-      rev = "088ef81759f22bf0115a52f183ba66b0be3b9ef2";
-      sha256 = "1rj20lllf9awx0150frxckgwv1h6a1rv90dyz206lp3b4jvsf7pf";
-    };
-    nativeBuildInputs = drv.nativeBuildInputs ++ (with self; [ autoreconfHook autoconf-archive bison flex libxml2 libxslt docbook5 docbook5_xsl ]);
-  });
 }
diff --git a/release.nix b/release.nix
index db47d3f..e24e25f 100644
--- a/release.nix
+++ b/release.nix
@@ -1,4 +1,4 @@
 { inherit (import ./default.nix {}) hyperkit virtsock vpnkit go-vpnkit
   linuxkit linuxkit-builder nix-linuxkit-runner nix-script-store-plugin
-  nixUnstable;
+  nix;
 }