diff --git a/webapp.nix b/webapp.nix
index 966e123..851b203 100644
--- a/webapp.nix
+++ b/webapp.nix
@@ -18,12 +18,13 @@ let
     # Fixed-output derivation of the pnpm offline store.
     # On first build / lockfile change, set hash = lib.fakeHash and rebuild;
     # Nix will report the correct hash to substitute.
-    pnpmDeps = pkgs.pnpm.fetchDeps {
+    pnpmDeps = pkgs.fetchPnpmDeps {
       inherit (finalAttrs) pname version src;
       hash = cfg.pnpmDepsHash;
+      fetcherVersion = 2;
     };
 
-    nativeBuildInputs = [ pkgs.nodejs_20 pkgs.pnpm.configHook ];
+    nativeBuildInputs = [ pkgs.nodejs_20 pkgs.pnpmConfigHook ];
 
     # Skip Electron binary download (we're building a web app, not desktop)
     ELECTRON_SKIP_BINARY_DOWNLOAD = "1";