EXHIBIT 32

      CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER
                                   PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, John S. Chen, certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Annual
Report of Sybase, Inc. on Form 10-K for the fiscal year ended December 31, 2003
fully complies with the requirements of Section 13(a) or 15(d) of the Securities
Exchange Act of 1934 and that information contained in such Annual Report
fairly presents in all material respects the financial condition and results of
operations of Sybase, Inc.

                                              By: /s/ JOHN S. CHEN
                                                  -----------------------------
                                              Name: John S. Chen
                                              Title: Chief Executive Officer
                                                      and President

I, Pieter A. Van der Vorst, certify, pursuant to 18 U.S.C. Section 1350, as
adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the
Annual Report of Sybase, Inc. on Form 10-K for the fiscal year ended December
31, 2003 fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934 and that information contained in such Annual
Report fairly presents in all material respects the financial condition and
results of operations of Sybase, Inc.

                                              By: /s/ PIETER A. VAN DER VORST
                                                  ------------------------------
                                              Name: Pieter A. Van der Vorst
                                              Title: Senior Vice President and
                                                     Chief Financial Officer