Warning regarding iOS build target

When building i get this: 

warning: The iOS deployment target 'IPHONEOS_DEPLOYMENT_TARGET' is set
    to 8.0, but the range of supported deployment target versions is 9.0 to 15.2.99. (in target 'libPhoneNumber-iOS' from project 'Pods')
    /Users/vytautaspranskunas/Desktop/Development/senioassist-mobile/ios/Pods/Pods.xcodeproj: