diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/date.txt b/pkgs/by-name/ni/nixfmt-rfc-style/date.txt
index c471a757cea5..b489d080c1cd 100644
--- a/pkgs/by-name/ni/nixfmt-rfc-style/date.txt
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/date.txt
@@ -1 +1 @@
-2024-07-12
+2024-08-08
diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix b/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix
index 2a52509d1f16..9e73ac8e2e75 100644
--- a/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix
@@ -1,15 +1,16 @@
 # This file has been autogenerate with cabal2nix.
 # Update via ./update.sh
-{ mkDerivation, base, cmdargs, directory, fetchzip, filepath, lib
-, megaparsec, mtl, parser-combinators, pretty-simple
-, safe-exceptions, scientific, text, transformers, unix
+{ mkDerivation, base, bytestring, cmdargs, directory, fetchzip
+, file-embed, filepath, lib, megaparsec, mtl, parser-combinators
+, pretty-simple, safe-exceptions, scientific, text, transformers
+, unix
 }:
 mkDerivation {
   pname = "nixfmt";
   version = "0.6.0";
   src = fetchzip {
-    url = "https://github.com/nixos/nixfmt/archive/83de1eceaae8a891ae52a3a2b82226540207309e.tar.gz";
-    sha256 = "0lnl9vlbyrfplmq3hpmpjlmhjdwwbgk900wgi25ib27v0mlgpnxp";
+    url = "https://github.com/nixos/nixfmt/archive/a707c70ab6fed71032ac55bb1029306a50a80d34.tar.gz";
+    sha256 = "1v5hch8j1w1bvn2r4xz4ym60ykgsc074y28vpin9qraagv06x8sm";
   };
   isLibrary = true;
   isExecutable = true;
@@ -18,7 +19,8 @@ mkDerivation {
     text transformers
   ];
   executableHaskellDepends = [
-    base cmdargs directory filepath safe-exceptions text unix
+    base bytestring cmdargs directory file-embed filepath
+    safe-exceptions text unix
   ];
   jailbreak = true;
   homepage = "https://github.com/NixOS/nixfmt";
diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/package.nix b/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
index a11e2d29ff69..980a840d6408 100644
--- a/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
@@ -8,13 +8,17 @@
 let
   inherit (haskell.lib.compose) overrideCabal justStaticExecutables;
 
-  overrides = {
+  overrides = rec {
     version = "unstable-${lib.fileContents ./date.txt}";
 
     passthru.updateScript = ./update.sh;
 
     maintainers = lib.teams.formatter.members;
 
+    preBuild = ''
+      echo -n 'nixpkgs-${version}' > .version
+    '';
+
     # These tests can be run with the following command.
     #
     # $ nix-build -A nixfmt-rfc-style.tests