diff --git a/Package.swift b/Package.swift
index 5d3b22d..5979824 100644
--- a/Package.swift
+++ b/Package.swift
@@ -6,11 +6,10 @@ import PackageDescription
 let package = Package(
     name: "AsyncBackports",
     platforms: [
-        // TODO: Xcode 13.2 set targets where backport available
-        .macOS(.v12),
-        .iOS(.v15),
-        .watchOS(.v8),
-        .tvOS(.v15),
+        .macOS(.v10_15),
+        .iOS(.v13),
+        .watchOS(.v6),
+        .tvOS(.v13),
     ],
     products: [
         .library(name: "AsyncBackports", targets: ["AsyncBackports"]),
diff --git a/Sources/AsyncBackports/URLSession+Backport.swift b/Sources/AsyncBackports/URLSession+Backport.swift
index 0c7becd..c0f501a 100644
--- a/Sources/AsyncBackports/URLSession+Backport.swift
+++ b/Sources/AsyncBackports/URLSession+Backport.swift
@@ -18,6 +18,7 @@ public extension Backport where Original: URLSession {
         if #available(macOS 12.0, iOS 15.0, tvOS 15.0, watchOS 8.0, *) {
             return try await original.data(for: request, delegate: delegate)
         } else {
+            precondition(delegate == nil, "Cannot set delegate")
             return try await withUnsafeThrowingContinuation { continuation in
                 let task = URLSession.shared.dataTask(with: request) { data, response, error in
                     if let data = data, let response = response {
@@ -28,7 +29,6 @@ public extension Backport where Original: URLSession {
                         fatalError("Neither response nor error")
                     }
                 }
-                task.delegate = delegate
                 task.resume()
             }
         }