# Notification callback service: TLS upgrade to V1.2

**URL:** https://community.crossref.org/t/notification-callback-service-tls-upgrade-to-v1-2/4787
**Category:** Content Registration
**Tags:** callbacknotification, content-registration
**Created:** [31 January 2024 17:10 UTC](https://community.crossref.org/t/notification-callback-service-tls-upgrade-to-v1-2/4787 "2024-01-31T17:10:53Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![rlammey](https://sea2.discourse-cdn.com/flex020/user_avatar/community.crossref.org/rlammey/32/17_2.png) [@rlammey](https://community.crossref.org/u/rlammey)
#### Post date: [31 January 2024 17:10 UTC](https://community.crossref.org/t/notification-callback-service-tls-upgrade-to-v1-2/4787/1 "2024-01-31T17:10:53Z")

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Hi all,  
On 30 January we made an upgrade in our test and production systems to support TLS 1.2 for our notification callback service that some members use. TLS 1.2 is standard and widely supported, but we also support backwards compatibility with TLS 1.1.

Let us know if you’re seeing any issues due using older versions TLS.

Thanks!  
Rachael