国家秘密的密级、保密期限和知悉范围的变更，由原定密机关、单位决定，也可以由其上级机关决定。

The modification of the classification level, secrecy period and access scope of a state secret shall be decided by the organ or entity which originally determined the state secret or by its superior.

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第十八条国家秘密的密级、保密期限和知悉范围，应当根据情况变化及时变更。

Article 18 The classification levels, secrecy periods and access scopes of state secrets shall be timely modified in light of changes of situations.

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