diff --git a/Package.swift b/Package.swift
index 221e2d5..3044d58 100644
--- a/Package.swift
+++ b/Package.swift
@@ -5,6 +5,7 @@ import PackageDescription
 
 let package = Package(
     name: "SwiftRichString",
+    platforms: [.iOS(.v8), .macOS(.v10_11)],
     products: [
         // Products define the executables and libraries produced by a package, and make them visible to other packages.
         .library(