BizTalk 2013 r2 CU1 update is available. Please install in your DIT , SIT environments and check if it is breaking any code and do the regression testing.
below are fixes that were covered.
BizTalk Server management tools and business tools
BizTalk Server B2B support
BizTalk Server Accelerators
BizTalk Server Adapters
BizTalk Server Design Tools
BizTalk Server Message Runtime, Pipelines, and Tracking