diff --git a/flake.nix b/flake.nix
index 60354d7..63afd7b 100755
--- a/flake.nix
+++ b/flake.nix
@@ -8,7 +8,7 @@
 
     # nixpkgs
     nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-    #nixpkgs-last-unstable.url = "github:NixOS/nixpkgs/6b4955211758ba47fac850c040a27f23b9b4008f";
+    # nixpkgs-last-unstable.url = "github:NixOS/nixpkgs/6b4955211758ba47fac850c040a27f23b9b4008f";
     # nixpkgs-calibre-web.url = "github:NixOS/nixpkgs/e6f23dc08d3624daab7094b701aa3954923c6bbb";
     nixpkgs-master.url = "github:NixOS/nixpkgs/master";
     nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-25.05";
diff --git a/modules/server/calibre-web.nix b/modules/server/calibre-web.nix
index 4b82ecd..d229395 100644
--- a/modules/server/calibre-web.nix
+++ b/modules/server/calibre-web.nix
@@ -5,10 +5,14 @@
   ...
 }:
 let
-    work = import (builtins.fetchTarball {
-        url = "https://github.com/NixOS/nixpkgs/archive/e6f23dc08d3624daab7094b701aa3954923c6bbb.tar.gz";
-    }) {};
-    # myPkg = work.calibre-web;
+  work = import (builtins.fetchGit {
+      # Descriptive name to make the store path easier to identify
+      name = "my-old-revision";
+      url = "https://github.com/NixOS/nixpkgs/";
+      ref = "refs/heads/nixpkgs-unstable";
+      rev = "e6f23dc08d3624daab7094b701aa3954923c6bbb";
+  }) {};
+  # myPkg = work.calibre-web;
 in
 {
   # services.calibre-server.package = stable.calibre;