diff --git a/pkgs/by-name/gr/gren/generated-package.nix b/pkgs/by-name/gr/gren/generated-package.nix
new file mode 100644
index 000000000000..5fb245debbf9
--- /dev/null
+++ b/pkgs/by-name/gr/gren/generated-package.nix
@@ -0,0 +1,101 @@
+# This file has been autogenerated with cabal2nix.
+# Update via ./update.sh
+{
+  mkDerivation,
+  ansi-terminal,
+  ansi-wl-pprint,
+  base,
+  base64-bytestring,
+  binary,
+  bytestring,
+  containers,
+  directory,
+  edit-distance,
+  fetchgit,
+  filelock,
+  filepath,
+  ghc-prim,
+  haskeline,
+  hspec,
+  hspec-discover,
+  indexed-traversable,
+  lib,
+  mtl,
+  prettyprint-avh4,
+  process,
+  raw-strings-qq,
+  scientific,
+  text,
+  time,
+  utf8-string,
+  vector,
+}:
+mkDerivation {
+  pname = "gren";
+  version = "0.4.5";
+  src = fetchgit {
+    url = "https://github.com/gren-lang/compiler.git";
+    sha256 = "0hbxzn14m9y7sqwk347yj7hblwmj5fyzmy7kjqc8zjd63gmrkdh8";
+    rev = "0efe25e3f48663a36eec525d2df0d957f53c9b4e";
+    fetchSubmodules = true;
+  };
+  isLibrary = false;
+  isExecutable = true;
+  executableHaskellDepends = [
+    ansi-terminal
+    ansi-wl-pprint
+    base
+    base64-bytestring
+    binary
+    bytestring
+    containers
+    directory
+    edit-distance
+    filelock
+    filepath
+    ghc-prim
+    haskeline
+    indexed-traversable
+    mtl
+    prettyprint-avh4
+    process
+    raw-strings-qq
+    scientific
+    text
+    time
+    utf8-string
+    vector
+  ];
+  testHaskellDepends = [
+    ansi-terminal
+    ansi-wl-pprint
+    base
+    base64-bytestring
+    binary
+    bytestring
+    containers
+    directory
+    edit-distance
+    filelock
+    filepath
+    ghc-prim
+    haskeline
+    hspec
+    indexed-traversable
+    mtl
+    prettyprint-avh4
+    process
+    raw-strings-qq
+    scientific
+    text
+    time
+    utf8-string
+    vector
+  ];
+  testToolDepends = [ hspec-discover ];
+  jailbreak = true;
+  homepage = "https://gren-lang.org";
+  description = "The `gren` command line interface";
+  license = lib.licenses.bsd3;
+  mainProgram = "gren";
+}
diff --git a/pkgs/by-name/gr/gren/package.nix b/pkgs/by-name/gr/gren/package.nix
new file mode 100644
index 000000000000..aea0293fe2ea
--- /dev/null
+++ b/pkgs/by-name/gr/gren/package.nix
@@ -0,0 +1,21 @@
+{
+  lib,
+  haskell,
+  haskellPackages,
+}:
+
+let
+  inherit (haskell.lib.compose) overrideCabal;
+
+  raw-pkg = (haskellPackages.callPackage ./generated-package.nix { }).overrideScope (
+    final: prev: {
+      ansi-wl-pprint = final.ansi-wl-pprint_0_6_9;
+    }
+  );
+
+  overrides = {
+    maintainers = with lib.maintainers; [ tomasajt ];
+    passthru.updateScript = ./update.sh;
+  };
+in
+overrideCabal overrides raw-pkg
diff --git a/pkgs/by-name/gr/gren/update.sh b/pkgs/by-name/gr/gren/update.sh
new file mode 100755
index 000000000000..1b697ecb88dd
--- /dev/null
+++ b/pkgs/by-name/gr/gren/update.sh
@@ -0,0 +1,22 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p cabal2nix curl jq nixfmt-rfc-style
+
+set -euo pipefail
+
+# This is the directory of this update.sh script.
+script_dir="$(dirname "${BASH_SOURCE[0]}")"
+derivation_file="${script_dir}/generated-package.nix"
+latest_version="$(curl --silent 'https://api.github.com/repos/gren-lang/compiler/releases/latest' | jq --raw-output '.tag_name')"
+
+echo "Updating gren to version ${latest_version}."
+echo "Running cabal2nix and outputting to ${derivation_file}..."
+
+cat > "${derivation_file}" << EOF
+# This file has been autogenerated with cabal2nix.
+# Update via ./update.sh
+EOF
+
+cabal2nix 'https://github.com/gren-lang/compiler.git' --revision "${latest_version}" --jailbreak >> "${derivation_file}"
+nixfmt "${derivation_file}"
+
+echo 'Finished.'