diff --git a/pkgs/overlays/unstable.nix b/pkgs/overlays/unstable.nix
index 297b3ae..73e79b9 100644
--- a/pkgs/overlays/unstable.nix
+++ b/pkgs/overlays/unstable.nix
@@ -2,18 +2,9 @@ self: super:
 
 let
   nixos = self.config.nixos or true;
-  unstableRevision = self.config.unstableRevision or null;
-  unstableRevisionHash = self.config.unstableRevisionHash or null;
   useUnstable = self.config.useUnstable or true;
 
-  unstablePkgsExprs = if !builtins.isNull unstableRevision
-    then if !builtins.isNull unstableRevisionHash
-      then builtins.fetchTarball {
-        url = "https://github.com/NixOS/nixpkgs/archive/${unstableRevision}.tar.gz";
-        sha256 = unstableRevisionHash;
-      }
-      else builtins.fetchTarball "https://github.com/NixOS/nixpkgs/archive/${unstableRevision}.tar.gz"
-    else if nixos
+  unstablePkgsExprs = if nixos
       then builtins.fetchTarball "https://channels.nixos.org/nixos-unstable/nixexprs.tar.xz"
       else builtins.fetchTarball "https://channels.nixos.org/nixpkgs-unstable/nixexprs.tar.xz";