diff --git a/flake.nix b/flake.nix
index 9ba36c4..a608ee9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -17,8 +17,6 @@
 
     unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-    master.url = "github:NixOS/nixpkgs/0b1525114a2a9bc8eeee774fec9e7b0f1b1e543c";
-
     flake-utils.url = "github:numtide/flake-utils";
 
     colmena.url = "github:zhaofengli/colmena";