diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ccdbede..c2dd59a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,4 +14,6 @@ permissions:
 jobs:
   call-workflow:
     uses: skiptools/actions/.github/workflows/skip-framework.yml@v1
-
+    with:
+      runs-on: "['macos-15-intel', 'ubuntu-24.04']"
+      swift-android-sdk-version: "['', 'nightly-main']"
diff --git a/Package.swift b/Package.swift
index 349eeb8..933da08 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version: 5.9
+// swift-tools-version: 6.1
 import PackageDescription
 
 let package = Package(
diff --git a/Sources/SkipAndroidBridge/AndroidBridgeBootstrap.swift b/Sources/SkipAndroidBridge/AndroidBridgeBootstrap.swift
index 5292554..fcba764 100644
--- a/Sources/SkipAndroidBridge/AndroidBridgeBootstrap.swift
+++ b/Sources/SkipAndroidBridge/AndroidBridgeBootstrap.swift
@@ -64,7 +64,7 @@ public class AndroidBridge {
 /// get `Foundation` idioms working with Android conventions.
 // SKIP @bridge
 public class AndroidBridgeBootstrap {
-    private static var androidBridgeInit = false
+    nonisolated(unsafe) private static var androidBridgeInit = false
 
     /// Perform all the setup that is needed to get `Foundation` idioms working with Android conventions.
     ///
diff --git a/Sources/SkipAndroidBridge/AndroidBundle.swift b/Sources/SkipAndroidBridge/AndroidBundle.swift
index 09719f5..67827b2 100644
--- a/Sources/SkipAndroidBridge/AndroidBundle.swift
+++ b/Sources/SkipAndroidBridge/AndroidBundle.swift
@@ -50,16 +50,19 @@ open class AndroidBundle : Foundation.Bundle, @unchecked Sendable {
         super.init(path: Foundation.Bundle.main.bundlePath)!
     }
 
-    // These inits require 'override' on Android but not iOS or ROBOLECTRIC
+    // These inits require 'override' on Android but not iOS or ROBOLECTRIC.
+    // They must not be marked unavailable because the auto-generated
+    // resource_bundle_accessor.swift (produced by the swiftbuild build system)
+    // calls Bundle(for: BundleFinder.self) as part of its fallback chain.
     #if os(Android)
-    @available(*, unavailable)
     public override init(for aClass: AnyClass) {
-        fatalError()
+        self.bundleAccess = BundleAccess.main
+        super.init(path: Foundation.Bundle.main.bundlePath)!
     }
 
-    @available(*, unavailable)
     public override init?(identifier: String) {
-        fatalError()
+        self.bundleAccess = BundleAccess.main
+        super.init(path: Foundation.Bundle.main.bundlePath)!
     }
     #endif
 
diff --git a/Sources/SkipAndroidBridge/AndroidUserDefaults.swift b/Sources/SkipAndroidBridge/AndroidUserDefaults.swift
index c015d39..9a0043c 100644
--- a/Sources/SkipAndroidBridge/AndroidUserDefaults.swift
+++ b/Sources/SkipAndroidBridge/AndroidUserDefaults.swift
@@ -7,7 +7,7 @@ open class AndroidUserDefaults : Foundation.UserDefaults {
     open override class var standard: AndroidUserDefaults {
         return _standard
     }
-    private static let _standard = AndroidUserDefaults()
+    nonisolated(unsafe) private static let _standard = AndroidUserDefaults()
 
     private let userDefaultsAccess: UserDefaultsAccess
 
diff --git a/Sources/SkipAndroidBridge/AssetURLProtocol.swift b/Sources/SkipAndroidBridge/AssetURLProtocol.swift
index e011130..4b64a52 100644
--- a/Sources/SkipAndroidBridge/AssetURLProtocol.swift
+++ b/Sources/SkipAndroidBridge/AssetURLProtocol.swift
@@ -11,10 +11,10 @@ fileprivate let logger: Logger = Logger(subsystem: "skip.android.bridge", catego
 /// A custom URLProtocol that serves requests from the native Android `AAssetManager`, which is implemented in `swift-android-native / AndroidAssetManager.swift`
 public class AssetURLProtocol: URLProtocol {
     /// The URL scheme that this protocol handles
-    public static var scheme = "asset"
+    public static let scheme = "asset"
 
-    private static var registered = false
-    private static var assetManager: AndroidAssetManager? = nil
+    nonisolated(unsafe) private static var registered = false
+    nonisolated(unsafe) private static var assetManager: AndroidAssetManager? = nil
 
     public static func register() throws {
         if registered { return }
diff --git a/Tests/SkipAndroidBridgeSamplesTests/SkipAndroidBridgeSamplesTests.swift b/Tests/SkipAndroidBridgeSamplesTests/SkipAndroidBridgeSamplesTests.swift
index 4594dcb..0ed27fb 100644
--- a/Tests/SkipAndroidBridgeSamplesTests/SkipAndroidBridgeSamplesTests.swift
+++ b/Tests/SkipAndroidBridgeSamplesTests/SkipAndroidBridgeSamplesTests.swift
@@ -99,7 +99,7 @@ final class SkipAndroidBridgeSamplesTests: XCTestCase {
         }
 
         // SkipAndroidBridgeSamplesTests.kt testAndroidContext -> SkipAndroidBridgeSamples.kt nativeAndroidContextPackageName -> SkipAndroidBridgeSamples.swift nativeAndroidContextPackageName -> AndroidContext.swift getPackageName()
-        XCTAssertEqual("skip.android.bridge.samples.test", try nativeAndroidContextPackageName())
+        XCTAssertEqual("skip.android.bridge.samples.module.test", try nativeAndroidContextPackageName())
     }
 
     func testLocalizedStringResource() throws {
diff --git a/Tests/SkipAndroidBridgeTests/AndroidBridgeTests.swift b/Tests/SkipAndroidBridgeTests/AndroidBridgeTests.swift
index 81285f5..43d7d87 100644
--- a/Tests/SkipAndroidBridgeTests/AndroidBridgeTests.swift
+++ b/Tests/SkipAndroidBridgeTests/AndroidBridgeTests.swift
@@ -29,13 +29,13 @@ final class AndroidBridgeTests: XCTestCase {
         let cacheDir = URL(fileURLWithPath: context.getCacheDir().getAbsolutePath(), isDirectory: true)
 
         if isRobolectric {
-            // Robolectric's files folder is tough to predict (e.g. /var/folders/zl/wkdjv4s1271fbm6w0plzknkh0000gn/T/robolectric-AndroidBridgeTests_testAndroidBridge_SkipAndroidBridge_debugUnitTest10131350412654065418/skip.android.bridge.test-dataDir/files)
-            XCTAssertTrue(filesDir.path.hasSuffix("/files"), "unexpected filesDir.path: \(filesDir.path)")
-            XCTAssertTrue(cacheDir.path.hasSuffix("/cache"), "unexpected cacheDir.path: \(cacheDir.path)")
+            // Robolectric's files folder is tough to predict (e.g. /var/folders/zl/wkdjv4s1271fbm6w0plzknkh0000gn/T/robolectric-AndroidBridgeTests_testAndroidBridge_SkipAndroidBridge_debugUnitTest10131350412654065418/skip.android.bridge.module.test-dataDir/files)
+            XCTAssertTrue(filesDir.path.hasSuffix("/skip.android.bridge.module.test-dataDir/files"), "unexpected filesDir.path: \(filesDir.path)")
+            XCTAssertTrue(cacheDir.path.hasSuffix("/skip.android.bridge.module.test-dataDir/cache"), "unexpected cacheDir.path: \(cacheDir.path)")
         } else {
             // …but Android is predictably the app's "files" and "cache" directories
-            XCTAssertEqual("/data/user/0/skip.android.bridge.test/files", filesDir.path)
-            XCTAssertEqual("/data/user/0/skip.android.bridge.test/cache", cacheDir.path)
+            XCTAssertEqual("/data/user/0/skip.android.bridge.module.test/files", filesDir.path)
+            XCTAssertEqual("/data/user/0/skip.android.bridge.module.test/cache", cacheDir.path)
         }
 
         // make sure we can read and write to the filesDir