diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/date.txt b/pkgs/by-name/ni/nixfmt-rfc-style/date.txt
deleted file mode 100644
index 24a34eca600b..000000000000
--- a/pkgs/by-name/ni/nixfmt-rfc-style/date.txt
+++ /dev/null
@@ -1 +0,0 @@
-2025-04-04
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 1da633e8999d..03e7998038e4 100644
--- a/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/generated-package.nix
@@ -23,10 +23,10 @@
 }:
 mkDerivation {
   pname = "nixfmt";
-  version = "0.6.0";
+  version = "1.0.0";
   src = fetchzip {
-    url = "https://github.com/nixos/nixfmt/archive/65af4b69133d19f534d97746c97c2d5b464f43b4.tar.gz";
-    sha256 = "0l0w3janvss1n1j7qkcml97zndm2jm2gbrzzs9d8l0ixnrw0cd5r";
+    url = "https://github.com/nixos/nixfmt/archive/v1.0.0.tar.gz";
+    sha256 = "0iy2p893b2b5y4mvhy0d62675a7nd8fc6jm9mr32v9h2baj9ii3p";
   };
   isLibrary = true;
   isExecutable = true;
diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/package.nix b/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
index 90e659765b68..814d1db5af44 100644
--- a/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/package.nix
@@ -8,25 +8,17 @@
 let
   inherit (haskell.lib.compose) overrideCabal justStaticExecutables;
 
-  overrides = rec {
-    version = "unstable-${lib.fileContents ./date.txt}";
-
+  overrides = {
     passthru.updateScript = ./update.sh;
 
     teams = [ lib.teams.formatter ];
 
-    preBuild = ''
-      echo -n 'nixpkgs-${version}' > .version
-    '';
-
     # These tests can be run with the following command.
     #
     # $ nix-build -A nixfmt-rfc-style.tests
-    passthru.tests =
-      runCommand "nixfmt-rfc-style-tests" { nativeBuildInputs = [ nixfmt-rfc-style ]; }
-        ''
-          nixfmt --version > $out
-        '';
+    passthru.tests = runCommand "nixfmt-tests" { nativeBuildInputs = [ nixfmt-rfc-style ]; } ''
+      nixfmt --version > $out
+    '';
   };
   raw-pkg = haskellPackages.callPackage ./generated-package.nix { };
 in
diff --git a/pkgs/by-name/ni/nixfmt-rfc-style/update.sh b/pkgs/by-name/ni/nixfmt-rfc-style/update.sh
index 9213c7396452..e37006d78045 100755
--- a/pkgs/by-name/ni/nixfmt-rfc-style/update.sh
+++ b/pkgs/by-name/ni/nixfmt-rfc-style/update.sh
@@ -8,15 +8,11 @@ set -eo pipefail
 
 # This is the directory of this update.sh script.
 script_dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
-
 derivation_file="${script_dir}/generated-package.nix"
-date_file="${script_dir}/date.txt"
 
-# This is the latest version of nixfmt-rfc-style branch on GitHub.
-new_version=$(curl --silent https://api.github.com/repos/nixos/nixfmt/git/refs/heads/master | jq '.object.sha' --raw-output)
-new_date=$(curl --silent https://api.github.com/repos/nixos/nixfmt/git/commits/"$new_version" | jq '.committer.date' --raw-output)
+release_tag=$(curl --silent https://api.github.com/repos/NixOS/nixfmt/releases/latest | jq '.tag_name' --raw-output)
 
-echo "Updating nixfmt-rfc-style to version $new_date."
+echo "Updating nixfmt-rfc-style to version $release_tag."
 echo "Running cabal2nix and outputting to ${derivation_file}..."
 
 cat > "$derivation_file" << EOF
@@ -25,9 +21,7 @@ cat > "$derivation_file" << EOF
 EOF
 
 cabal2nix --jailbreak \
-  "https://github.com/nixos/nixfmt/archive/${new_version}.tar.gz" \
+  "https://github.com/nixos/nixfmt/archive/${release_tag}.tar.gz" \
   >> "$derivation_file"
 
-date --date="$new_date" -I > "$date_file"
-
 echo "Finished."