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![](https://cocalc.com/share/raw/3406dea71b0c98ec5fb25f01db05394e46558f3c/Images/Conat/Screenshot%202025-06-17%20at%2011.42.47%E2%80%AFAM.png)

We will be performing a critical update on Saturday, June 21st, which will result in approximately one hour of downtime for CoCalc services. The maintenance window is scheduled from 6am-7am (PDT).

This update is crucial for improving the stability and performance of CoCalc. Specifically, we will be addressing issues related to using NATS.io in our communication layer. We are replacing it with a new solution called "Conat".

Conat is the result of significant development effort aimed at providing a more robust and efficient communication backbone for CoCalc. For those interested in the technical details and the hard work that has gone into this, you can explore the GitHub pull request here: https://github.com/sagemathinc/cocalc/pull/8346.

Please plan accordingly for this brief interruption in service. We will send out further reminders closer to the date of the downtime.

Thank you for your continued support!

Sincerely, - The CoCalc Team

1-Hour CoCalc Downtime Expected Saturday Morning June 21st 

1-Hour CoCalc Downtime Expected Saturday Morning June 21st from 6am-7am PT

1-Hour CoCalc Downtime Expected Saturday Morning June 21st, 6am-7am PT

![](https://cocalc.com/share/raw/3406dea71b0c98ec5fb25f01db05394e46558f3c/Images/Conat/Screenshot%202025-06-17%20at%2011.42.47%E2%80%AFAM.png)

**We will be performing a critical update on Saturday, June 21st, from 6am-7am PT, which will result in approximately one hour of downtime for CoCalc services.** 

This update is crucial for improving the stability and performance of CoCalc. Specifically, we will be addressing issues related to using NATS.io in our communication layer. We are replacing it with a new solution called "Conat".

Conat is the result of significant development effort aimed at providing a more robust and efficient communication backbone for CoCalc. For those interested in the technical details and the hard work that has gone into this, you can explore the GitHub pull request here: https://github.com/sagemathinc/cocalc/pull/8346.

Please plan accordingly for this brief interruption in service. We will send out further reminders closer to the date of the downtime.

Thank you for your continued support!

Sincerely, - The CoCalc Team

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