Following to the integration of SNOMED CT in a local electronic health record, the benefits have been increasing with time. However, such benefits may be degraded when the right information is not accessed at the right time. The purpose of this thesis work is to develop an update management solution to the local expression repository that comes from SNOMED CT. The method used to implement the work involves understanding the existing work, developing an update management prototype and testing the implemented system. The update version system for the expression repository is basically the same as the SNOMED CT core components version mechanism. The update rules are constructed under the ambiguous and duplicate inactivation reasons. The results from the evaluation and testing shows that the implemented system is able to handle the update for possible expressions. The conclusion is that it is recommended to include not only the two major update reason but every possible update that could be released from SNOMED CT so that no information loss would generally happen.