Ohio Rev. Code Ann. § 135.37
(A) Except as provided in section 135.353 or 135.354 of the Revised Code, any institution described in section 135.32 of the Revised Code in receipt of a deposit of public moneys under section 135.33 or 135.35 of the Revised Code shall provide security for the repayment of all public moneys deposited in the public depository by selecting one of the following methods:
(G) When the public depository has placed eligible securities described in divisions (D)(2) to (9) of section 135.18 of the Revised Code with a trustee for safekeeping, the public depository may at any time substitute or exchange eligible securities having a current market value equal to or greater than the current market value of the securities then on deposit and for which they are to be substituted or exchanged without specific authorization from the investing authority of any such substitution or exchange only if one of the following applies: