Can you observe changes in EnvironmentObject?

Using Swift
1

Quick question about EnvironmentObject. Should I be able to observe changes in properties of it?

For example, in the below, if I click the Toggle button, I don't appear to get notificed that isOn is updated, and my UI does not updated.

struct DataSyncView : View {
    @EnvironmentObject private var foo : Foo

    var body : some View {
        VStack {
		Text("Value : \(String(foo.isOn))")
		Button("Toggle") {
			foo.update()
		}
	}
}

class Foo : ObservableObject {
    
    @Published var isOn = false

	func update() {
		foo.toggle()
	}
}

Update: Got it working. Solution was to use @Observable protocol

struct DataSyncView : View {
    @EnvironmentObject private var foo : Foo

    var body : some View {
        VStack {
        Text("Value : \(String(foo.isOn))")
        Button("Toggle") {
            foo.update()
        }
    }
}

@Observable
class Foo {

    var isOn = false

    func update() {
        isOn.toggle()
    }
}
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