diff --git a/Package.swift b/Package.swift
index 185d71f..7adff30 100644
--- a/Package.swift
+++ b/Package.swift
@@ -19,7 +19,10 @@ let package = Package(
     targets: [
         .target(
             name: "AsyncQueue",
-            dependencies: []),
+            dependencies: [],
+            swiftSettings: [
+                .enableUpcomingFeature("StrictConcurrency")
+            ]),
         .testTarget(
             name: "AsyncQueueTests",
             dependencies: ["AsyncQueue"],
diff --git a/README.md b/README.md
index ebceea3..612ea57 100644
--- a/README.md
+++ b/README.md
@@ -60,7 +60,6 @@ func testFIFOQueueOrdering() async {
             }
         }
 
-        nonisolated
         func flushQueue() async {
             await queue.enqueueAndWait { }
         }
@@ -110,7 +109,6 @@ func testActorQueueOrdering() async {
             }
         }
 
-        nonisolated
         func flushQueue() async {
             await queue.enqueueAndWait { _ in }
         }
@@ -148,7 +146,6 @@ func testMainActorQueueOrdering() async {
             }
         }
 
-        nonisolated
         func flushQueue() async {
             await MainActorQueue.shared.enqueueAndWait { }
         }