diff --git a/pkgs/tools/misc/topgrade/default.nix b/pkgs/tools/misc/topgrade/default.nix
index 191d66a6de80..e0aba2724af2 100644
--- a/pkgs/tools/misc/topgrade/default.nix
+++ b/pkgs/tools/misc/topgrade/default.nix
@@ -2,22 +2,21 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "topgrade";
-  version = "3.9.0";
+  version = "4.0.2";
 
   src = fetchFromGitHub {
     owner = "r-darwish";
     repo = pname;
     rev = "v${version}";
-    sha256 = "0g9pb4f5skigyahv8kpx7wkvv625lvgnbqz6iq7j7wgixxf4nl1i";
+    sha256 = "0kkk718s65r3j5k3a3wz9p0q1v8rjz0yshmfwxak3aw99nj9yyvq";
   };
 
-  # Delete this on next update; see #79975 for details
-  legacyCargoFetcher = true;
-
-  cargoSha256 = "1y85hl7xl60vsj3ivm6pyd6bvk39wqg25bqxfx00r9myha94iqmd";
+  cargoSha256 = "1g6jzbmicyqnp0dkcbw7sa36b3qxag8f596mb47wq2fl25pg0d3x";
 
   buildInputs = lib.optional stdenv.isDarwin Foundation;
 
+  # TODO: add manpage (topgrade.8) to postInstall on next update
+
   meta = with lib; {
     description = "Upgrade all the things";
     homepage = "https://github.com/r-darwish/topgrade";