diff --git a/pkgs/development/tools/electron/update.py b/pkgs/development/tools/electron/update.py
index 0303cb1c682b..6baf1135a796 100755
--- a/pkgs/development/tools/electron/update.py
+++ b/pkgs/development/tools/electron/update.py
@@ -1,5 +1,5 @@
 #! /usr/bin/env nix-shell
-#! nix-shell -i python -p python3.pkgs.joblib python3.pkgs.click python3.pkgs.click-log nix nix-prefetch-git prefetch-yarn-deps prefetch-npm-deps gclient2nix
+#! nix-shell -i python -p python3.pkgs.joblib python3.pkgs.click python3.pkgs.click-log nix nurl prefetch-yarn-deps prefetch-npm-deps gclient2nix
 """
 electron updater
 
@@ -32,7 +32,7 @@ import urllib.request
 import click
 import click_log
 
-from datetime import datetime
+from datetime import datetime, UTC
 from typing import Iterable, Tuple
 from urllib.request import urlopen
 from joblib import Parallel, delayed, Memory
@@ -44,6 +44,9 @@ SOURCE_INFO_JSON = "info.json"
 
 os.chdir(os.path.dirname(__file__))
 
+# Absolute path of nixpkgs top-level directory
+NIXPKGS_PATH = subprocess.check_output(["git", "rev-parse", "--show-toplevel"]).decode("utf-8").strip()
+
 memory: Memory = Memory("cache", verbose=0)
 
 logger = logging.getLogger(__name__)
@@ -78,26 +81,34 @@ def get_electron_file(electron_tag: str, filepath: str) -> str:
     )
 
 
+@memory.cache
+def get_gn_hash(gn_version, gn_commit):
+    print("gn.override", file=sys.stderr)
+    expr = f'(import {NIXPKGS_PATH} {{}}).gn.override {{ version = "{gn_version}"; rev = "{gn_commit}"; hash = ""; }}'
+    out = subprocess.check_output(["nurl", "--hash", "--expr", expr])
+    return out.decode("utf-8").strip()
+
 @memory.cache
 def get_chromium_gn_source(chromium_tag: str) -> dict:
     gn_pattern = r"'gn_version': 'git_revision:([0-9a-f]{40})'"
     gn_commit = re.search(gn_pattern, get_chromium_file(chromium_tag, "DEPS")).group(1)
-    gn_prefetch: bytes = subprocess.check_output(
-        [
-            "nix-prefetch-git",
-            "--quiet",
-            "https://gn.googlesource.com/gn",
-            "--rev",
-            gn_commit,
-        ]
+
+    gn_commit_info = json.loads(
+        urlopen(f"https://gn.googlesource.com/gn/+/{gn_commit}?format=json")
+        .read()
+        .decode("utf-8")
+        .split(")]}'\n")[1]
     )
-    gn: dict = json.loads(gn_prefetch)
+
+    gn_commit_date = datetime.strptime(gn_commit_info["commiter"]["time"], "%a %b %d %H:%M:%S %Y %z")
+    gn_date = gn_commit_date.astimezone(UTC).date().isoformat()
+    gn_version = f"0-unstable-{gn_date}"
+
     return {
         "gn": {
-            "version": datetime.fromisoformat(gn["date"]).date().isoformat(),
-            "url": gn["url"],
-            "rev": gn["rev"],
-            "hash": gn["hash"],
+            "version": gn_version,
+            "rev": gn_commit,
+            "hash": get_gn_hash(gn_version, gn_commit),
         }
     }