GridServer 6.3.1 Hotfix10 has been released. Here are the release notes:
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Introduction
  
Hotfixes are cumulative.
  
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Affected Components for 6.3.1_hotfix10
 
The following components are updated by this hotfix:
 
Tomcat
 
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Closed Issues in 6.3.1_hotfix10 (This Release)
 
Tomcat
GS-18962
Apache tomcat has been upgraded to 9.0.105.
 
GS-18842
The third party library commons-collections jar is upgraded from 3.2.1 to 3.2.2.
 
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To download this hotfix, login to the Support Portal and navigate to Downloads > Hotfixes > AvailableDownloads > DataSynapse > GridServer > 6.3.1.

GridServer 6.3.1 Hotfix10 Release Announcement