diff --git a/flake.nix b/flake.nix
index 96e3e3e7..83feb26a 100644
--- a/flake.nix
+++ b/flake.nix
@@ -56,8 +56,7 @@
       in
       {
         devShells = with pkgs; rec {
-
-          default = impure;
+          default = pure;
 
           pure = mkShell {
             buildInputs = [