diff --git a/Package@swift-6.0.swift b/Package@swift-6.0.swift
index 837b5b0..2ea5ac8 100644
--- a/Package@swift-6.0.swift
+++ b/Package@swift-6.0.swift
@@ -28,11 +28,15 @@ let package = Package(
             name: "AsyncSequenceReader",
             dependencies: [],
             swiftSettings: [
-                .swiftLanguageVersion(.v6),
+                .swiftLanguageMode(.v6),
             ]
         ),
         .testTarget(
             name: "AsyncSequenceReaderTests",
-            dependencies: ["AsyncSequenceReader"]),
+            dependencies: ["AsyncSequenceReader"],
+            swiftSettings: [
+                .swiftLanguageMode(.v6),
+            ]
+        ),
     ]
 )
diff --git a/Tests/AsyncSequenceReaderTests/AsyncBufferedIteratorTests.swift b/Tests/AsyncSequenceReaderTests/AsyncBufferedIteratorTests.swift
index 8e815d8..3e20a7c 100644
--- a/Tests/AsyncSequenceReaderTests/AsyncBufferedIteratorTests.swift
+++ b/Tests/AsyncSequenceReaderTests/AsyncBufferedIteratorTests.swift
@@ -9,7 +9,7 @@
 import XCTest
 @testable import AsyncSequenceReader
 
-final class AsyncBufferedIteratorTests: XCTestCase {
+final class AsyncBufferedIteratorTests: XCTestCase, @unchecked Sendable {
     func testBufferIteratorFromStream() async throws {
         let testStream = AsyncStream<Int> { continuation in
             for value in 0..<10 {
diff --git a/Tests/AsyncSequenceReaderTests/AsyncIteratorMapSequenceTests.swift b/Tests/AsyncSequenceReaderTests/AsyncIteratorMapSequenceTests.swift
index d521bf1..b2d8641 100644
--- a/Tests/AsyncSequenceReaderTests/AsyncIteratorMapSequenceTests.swift
+++ b/Tests/AsyncSequenceReaderTests/AsyncIteratorMapSequenceTests.swift
@@ -9,7 +9,7 @@
 import XCTest
 @testable import AsyncSequenceReader
 
-final class AsyncIteratorMapSequenceTests: XCTestCase {
+final class AsyncIteratorMapSequenceTests: XCTestCase, @unchecked Sendable {
     func testIteratorMapFromStream() async throws {
         let testStream = AsyncStream<String> { continuation in
             let data = ["2", "Hello,", "World!", "4", "My", "name", "is", "Dimitri.", "0", "1", "Bye!"]
diff --git a/Tests/AsyncSequenceReaderTests/AsyncReadUpToCountSequenceTests.swift b/Tests/AsyncSequenceReaderTests/AsyncReadUpToCountSequenceTests.swift
index b4490d9..7d42a29 100644
--- a/Tests/AsyncSequenceReaderTests/AsyncReadUpToCountSequenceTests.swift
+++ b/Tests/AsyncSequenceReaderTests/AsyncReadUpToCountSequenceTests.swift
@@ -9,7 +9,7 @@
 import XCTest
 @testable import AsyncSequenceReader
 
-final class AsyncReadUpToCountSequenceTests: XCTestCase {
+final class AsyncReadUpToCountSequenceTests: XCTestCase, @unchecked Sendable {
     func testIteratorMapFromStream() async throws {
         struct LocalError: Error {}
         
diff --git a/Tests/AsyncSequenceReaderTests/AsyncReadUpToElementsSequenceTests.swift b/Tests/AsyncSequenceReaderTests/AsyncReadUpToElementsSequenceTests.swift
index 88e0a9d..fcac256 100644
--- a/Tests/AsyncSequenceReaderTests/AsyncReadUpToElementsSequenceTests.swift
+++ b/Tests/AsyncSequenceReaderTests/AsyncReadUpToElementsSequenceTests.swift
@@ -9,7 +9,7 @@
 import XCTest
 @testable import AsyncSequenceReader
 
-final class AsyncReadUpToElementsSequenceTests: XCTestCase {
+final class AsyncReadUpToElementsSequenceTests: XCTestCase, @unchecked Sendable {
     func testIteratorMapUpToIncludingSequence() async throws {
         struct LocalError: Error {}
         
diff --git a/Tests/AsyncSequenceReaderTests/AsyncSequenceReaderTests.swift b/Tests/AsyncSequenceReaderTests/AsyncSequenceReaderTests.swift
index da4c839..2d90ae4 100644
--- a/Tests/AsyncSequenceReaderTests/AsyncSequenceReaderTests.swift
+++ b/Tests/AsyncSequenceReaderTests/AsyncSequenceReaderTests.swift
@@ -9,7 +9,7 @@
 import XCTest
 @testable import AsyncSequenceReader
 
-final class AsyncSequenceReaderTests: XCTestCase {
+final class AsyncSequenceReaderTests: XCTestCase, @unchecked Sendable {
     // MARK: - Test Manual Iteration
     
     func testReadSequenceFromStream() async throws {