How can I switch to Swift 4.0 in Xcode 9.3? : <p>It seems like I have only options to go to 3.3, or unspecified:</p>

<p><a href="https://i.stack.imgur.com/hR8ZK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hR8ZK.png" alt="enter image description here"></a></p>

<p>Can I switch to 4.0 somehow?</p>
