--- title: SDK 52 patches for Xcode 16.3 authors: Christian Falch published: April 1, 2025 --- We have released patches for four modules to address a breaking change in Xcode 16.3, which was released March 31st. The breaking change is the removal of a specific base template type in C++ in LLVM 19 (the Xcode compiler) and introduces errors when building Expo apps. You may encounter an error like this ([GitHub issue](https://github.com/expo/expo/issues/35807)): ```markup 298 | static_assert(is_standard_layout::value, "Character type of basic_string_view must be standard-layout"); 299 | static_assert(is_trivial::value, "Character type of basic_string_view must be trivial"); > 300 | static_assert(is_same<_CharT, typename traits_type::char_type>::value, | ^ implicit instantiation of undefined template 'std::char_traits' 301 | "traits_type::char_type must be the same type as CharT"); 302 | 303 | // [string.view.cons], construct/copy ``` We have published a fix to the affected packages with the following versions: - `expo-device@7.0.3` - `expo-gl@15.0.5` - `expo-dev-client@5.0.18` - `expo-dev-menu@6.0.23` (installed by `expo-dev-client`) - `expo-dev-launcher@5.0.33` (installed by `expo-dev-client`) Run the following command to upgrade these packages: ```console $ $ npx expo install --fix ``` In addition, React Native versions older than 0.77 have the same issues. This was fixed in `react-native@0.77.0` with an upgrade to the native dependency, Folly. You will need to use React Native 0.77 or newer if you are using Xcode 16.3. A fix for React Native 0.76 is in progress: [facebook/react-native#50431](https://github.com/facebook/react-native/pull/50431). If you need to use Xcode 16.3 on your project today, you can [learn more about using React Native 0.77 in SDK 52](https://expo.dev/changelog/2025-01-21-react-native-0.77).