diff --git a/shell.nix b/shell.nix
index 5611752..fdae90f 100644
--- a/shell.nix
+++ b/shell.nix
@@ -10,5 +10,6 @@ with pkgs;
       stylish-haskell # A simple Haskell code prettifier
       tea # Gitea official CLI client
       treefmt # one CLI to format the code tree
+      zlib # Lossless data-compression library
     ];
   }