My computed property is not updating (composables) - vue.js

Question

I'm starting to use Vue 3 and composables. However, it seems that the computed properties that depends on variables (or computed properties) in other composables are not updating.
This is my first composable:
import { ref, computed } from 'vue'
export default function useSum1() {
const num1 = ref(2)
const num2 = ref(3)
// Simple sum
const sum1 = computed(() => num1.value + num2.value)
return {
num1,
num2,
sum1
}
}
My second composable:
import { ref, computed } from 'vue'
export default function useSum2 () {
const num3 = ref(4)
const num4 = ref(1)
const sum2 = computed(() => num3.value + num4.value)
return {
num3,
num4,
sum2,
}
}
And my third composable, this one requieres sum1 and sum2 from the previous composables:
import { computed } from 'vue'
import useSum1 from './useSum1'
import useSum2 from './useSum2'
const { sum1 } = useSum1()
const { sum2 } = useSum2()
export default function useSum3() {
// This doesn't update when sum1 or sum2 changes, but works the first time
const sum3 = computed(() => sum1.value + sum2.value)
return {
sum3
}
}
In App.vue:
import useSum1 from './composables/useSum1'
import useSum2 from './composables/useSum2'
import useSum3 from './composables/useSum3'
const { num1, num2 } = useSum1()
const { num3, num4 } = useSum2()
const { sum3 } = useSum3()
setTimeout(() => {
num1.value = 3
}, 2500)
setTimeout(() => {
num3.value = 5
}, 5000)
// sum3 is always 10, never updates
Thank you for any help.