diff --git a/shell.nix b/shell.nix
index a960ebf..6588b4a 100644
--- a/shell.nix
+++ b/shell.nix
@@ -7,6 +7,7 @@ let
             python-escpos = pythonPrev.python-escpos.overrideAttrs (oldAttrs: {
               version = "0.0.0+unstable-2024-10-10";
               src = oldAttrs.src.override {
+                tag = null;
                 rev = "7d42f117161362e99c56431ebeb2ef1e9c91c495";
                 hash = "sha256-Wl7naHbsYfN+VYASQXyWrLNF953nwoM0ugiutE2jYNI=";
               };