diff --git a/default.nix b/default.nix
index 0e9bba3..ac0b4eb 100644
--- a/default.nix
+++ b/default.nix
@@ -4,7 +4,7 @@ haskellNix ? (import (import ./nix/sources.nix)."haskell.nix" { })
 # haskell.nix provides access to the nixpkgs pins which are used by our CI,
 # hence you will be more likely to get cache hits when using these.
 # But you can also just use your own, e.g. '<nixpkgs>'.
-, nixpkgsSrc ? haskellNix.sources.nixpkgs-2105
+, nixpkgsSrc ? haskellNix.sources.nixpkgs-2405
 
   # haskell.nix provides some arguments to be passed to nixpkgs, including some
   # patches and also the haskell.nix functionality itself as an overlay.