diff --git a/Sources/CartonHelpers/DefaultToolchain.swift b/Sources/CartonHelpers/DefaultToolchain.swift
index 5a31bbe..36480fe 100644
--- a/Sources/CartonHelpers/DefaultToolchain.swift
+++ b/Sources/CartonHelpers/DefaultToolchain.swift
@@ -12,4 +12,15 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-public let defaultToolchainVersion = "wasm-5.9.0-RELEASE"
+// TODO: make this `public let defaultToolchainVersion = "wasm-5.9.0-RELEASE"`
+// After a stable wasm-5.9 is released
+public let defaultToolchainVersion: String = {
+    // On macOS 14 (Sonoma) it's not possible to use Xcode older then 15.0
+    // Therefore Swift 5.9 is required on Sonoma
+    if #available(macOS 14, *) {
+        return "wasm-5.9-SNAPSHOT-2023-08-01-a"
+    }else{
+        // Use the latest stable release otherwise
+        return "wasm-5.8.0-RELEASE"
+    }
+}()