diff --git a/overlay.nix b/overlay.nix
index 4f5a6c8..6aade18 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -54,9 +54,6 @@ in
   prefetch-yarn-deps = prev.prefetch-yarn-deps.override {
     nix = final.nixVersions.nix_2_18_upstream;
   };
-  prefetch-npm-deps = prev.prefetch-npm-deps.override {
-    nix = final.nixVersions.nix_2_18_upstream;
-  };
   nix-prefetch-git = prev.nix-prefetch-git.override {
     nix = final.nixVersions.nix_2_18_upstream;
   };