This Guaranty may not be amended except in a writing signed by the Requisite Lenders (or all of the Lenders if required under the terms of the Term Loan Agreement), the Administrative Agent and each Guarantor subject to Section 13.17 of the Term Loan Agreement; provided , however , that any Subsidiary Guarantor may be released hereunder in accordance with the terms of Section 8.14. (c)  or Section 8.15. of the Term Loan Agreement , as applicable, and any Subsidiary may become a Guarantor hereunder by executing and delivering an Accession Agreement in accordance with Section 8.14. (a)  of the Term Loan Agreement.