> **Note:** Beginning September 3rd, 2015, Wufoo will be upgrading our server infrastructure to enhance system performance and security. Wufoo will upgrade our security certificates so that they are signed with Security Hash Algorithm 2 (SHA-2). Please read on if you use the Wufoo API, Webhooks, or access Wufoo via older technology and browsers.
In our ongoing effort to increase the security of Wufoo and keep up with best practices, Wufoo will be upgrading our security certificates so that they will now be signed with the more secure and industry accepted Security Hash Algorithm 2 (SHA-2). This change will occur and go live on **September 3, 2015**.
Almost all Wufoo customers and users will be totally unaffected by the change and service will continue as normal. Generally, if you or your users use any of the OS’s or browsers or higher in the following list, you will be unaffected by this change:
### Operating Systems
– Android 2.3+
– Apple iOS 3.0+
– Blackberry 5.0+
– Linux distributions newer than 2008
– Mac OS X 10.5+
– Windows XP with [Service Pack 3](https://support.microsoft.com/en-us/kb/968730)
– Windows Vista
– Windows 7
– Windows 8
– Windows 10
– Windows Server 2003 with [KB938397](https://support.microsoft.com/en-us/kb/938397)
– Chrome 26+
– Firefox 1.5+
– Internet Explorer 8+ (Windows XP with [Service Pack 3](https://support.microsoft.com/en-us/kb/968730))
– Konqueror 3.5.6+
– Mozilla 1.4+
– Netscape 7.1+
– Opera 9.0+
– Safari 3+
_There are some users who are using older technologies and software and may be affected by increasing the security of our certificates._ We **strongly** advise you to update your technologies to meet the above list to ensure continued and uninterrupted Wufoo service. If you or your users are using the following technologies, access to secure Wufoo forms, the Wufoo API, and even Webhooks will be affected.
### Operating Systems
– Windows XP without Service Pack 3
– Windows Server 2003 without KB938397
– Linux distributions older than 2008
– Any browser version that is older than listed above.
If you or your users are using these older technologies, your access to secure Wufoo forms, the Wufoo API, and even Webhooks will be affected. In order to keep communications between Wufoo and its customers as secure as possible, we need to update our certificates to be signed by Security Hash Algorithm 2 (SHA-2) which means users on these older technologies will need to update to newer, more modern, and more secure versions to continue to use Wufoo.
You can reference this [document](https://www.digicert.com/sha-2-compatibility.htm) for further detailed information about which browsers and operating systems support SHA-2 and which do not support it. If you have further questions or need support, please contact us at [Wufoo Support](http://help.wudev.com/wufoo_asksupport) and we’ll do our best to help you out.