Cumulative Update, apply to SSIS server or SSAS server ?

Hey Guys, 

I am having an issue with my SSIS package pulling data using MDX from an SSAS tabular data model, which looks like it's resolved by the CU below. My question is, we have an SSIS server, and a separate SSAS server, i'm not sure which server needs fixing to resolve the issue ?

I would prefer to know which instance needs fixing and not rock the boat on the other instance. 

https://support.microsoft.com/en-us/kb/3140211

Thanks !