> For the complete documentation index, see [llms.txt](https://valex.gitbook.io/valex/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://valex.gitbook.io/valex/external-fixes/signature-verification-failed-timestamp-too-old.md).

# Signature verification failed (timestamp too old)

Sync your Windows clock:

* Go to **Settings** → **Time & Language** → **Date & Time**
* Click **"Sync Now"** under "Synchronize your clock"
* Make sure **"Set time automatically"** is enabled