Update the minimum iOS version requirement in your application's `Info.plist` file to latest supported versions to enhance security and reduce exposure to vulnerabilities associated with deprecated iOS versions.

1. **Update Info.plist**: Modify the `MinimumOSVersion` key in your Info.plist file to specify a minimum iOS version that is not deprecated.

2. **Review Compatibility**: Ensure your application's features and dependencies are compatible with the new minimum iOS version requirement.

3. **Update Deployment Target**: In Xcode, update your project's iOS Deployment Target to match the new minimum version requirement.

4. **Test Thoroughly**: Test your application on devices running the new minimum iOS version to ensure all functionality works correctly.

5. **Consider User Impact**: Analyze your user base to understand the impact of dropping support for older iOS versions. Use App Store Connect analytics to determine the percentage of users on older versions.

6. **Gradual Migration**: If necessary, plan a gradual migration strategy where you announce the upcoming minimum version requirement in advance to give users time to update their devices.

7. **Regular Reviews**: Establish a process to regularly review and update the minimum iOS version requirement as part of your application maintenance cycle.

Example Info.plist entry:
```xml
<key>MinimumOSVersion</key>
<string>18.0</string>
```

By maintaining support for only recent iOS versions, you can take advantage of the latest security features and ensure your users benefit from the most up-to-date security protections available in the iOS ecosystem.