Neb. Rev. Stat. § 25-205

(1) Except as provided in subsection (2) of this section, an action upon a specialty, or any agreement, contract, or promise in writing, or foreign judgment, can only be brought within five years. No action at law or equity may be brought or maintained attacking the validity or enforceability of or to rescind or declare void and uncollectible any written contract entered into pursuant to, in compliance with, or in reliance on, a statute of the State of Nebraska which has been or hereafter is held to be unconstitutional by the Supreme Court of Nebraska where such holding is the basis for such action, unless such action be brought or maintained within one year from the effective date of such decision. The provisions hereof shall not operate to extend the time in which to bring any action or to revive any action now barred by reason of the operation of any previously existing limitation provision. (2) An action to recover collateral (a) the possession and ownership of which a debtor has in any manner transferred to another person and (b) which was used as security for payment pursuant to an agreement, contract, or promise in writing which covers farm products as described in section 9-102 , Uniform Commercial Code, or farm products which become inventory of a person engaged in farming, shall be brought within eighteen months from the date possession and ownership of such collateral was transferred.