ˌɔn tˈɛn dʒuːlˈaɪ nˈaɪntiːnhˈʌndɹɪd sˈɪksti fˈoːɹ, ðə jˌuːpˌiːjˈuː ɪŋkˈoːɹpɚɹˌeɪɾᵻd ðə tɹˈiːɾi ˌɪntʊ ɐ nˈuː kˌɑːnstɪtˈuːʃən ʌvðə jˌuːnɪvˈɜːsəl pˈoʊstəl jˈuːniən, wˌɪtʃ ɪz nˈaʊ ðə tɹˈiːɾi ðæt ɪz ɹˈæɾᵻfˌaɪd baɪ stˈeɪts wɛn ðeɪ wˈɪʃ tə dʒˈɔɪn ðə jˌuːpˌiːjˈuː.
On 10 July 1964, the UPU incorporated the treaty into a new Constitution of the Universal Postal Union, which is now the treaty that is ratified by states when they wish to join the UPU.