diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index e832e28f..4e041653 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -16,10 +16,10 @@ concurrency:
 jobs:
   library:
     name: Build and Run Unit Tests
-    runs-on: macos-13
+    runs-on: macos-14
     strategy:
       matrix:
-        xcode: ['14.3.1', '15.1']
+        xcode: ['15.2', '15.4', '16.0']
         config: ['debug', 'release']
     steps:
       - uses: actions/checkout@v3
@@ -28,7 +28,7 @@ jobs:
       - name: Run ${{ matrix.config }} tests
         run: make CONFIG=${{ matrix.config }} test-library
 
-      - uses: kishikawakatsumi/xcresulttool@v1
+      - uses: conradev/xcresulttool@v1.8.0
         with:
           path: TestResults.xcresult
         if: success() || failure()
diff --git a/Makefile b/Makefile
index 7be00a64..1234344f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,6 @@
 CONFIG = debug
-PLATFORM_IOS = iOS Simulator,name=iPhone 14
+PLATFORM_IOS = iOS Simulator,id=$(call udid_for,iOS,iPhone \d\+ Pro [^M])
+
 
 default: test-all
 
@@ -15,3 +16,7 @@ test-library:
 			-scheme klaviyo-swift-sdk-Package \
 			-destination platform="$$platform" || exit 1; \
 	done;
+
+define udid_for
+$(shell xcrun simctl list devices available '$(1)' | grep '$(2)' | sort -r | head -1 | awk -F '[()]' '{ print $$(NF-3) }')
+endef
diff --git a/Sources/KlaviyoSwift/StateManagement/StateManagement.swift b/Sources/KlaviyoSwift/StateManagement/StateManagement.swift
index 7ec9ea68..8d8a6764 100644
--- a/Sources/KlaviyoSwift/StateManagement/StateManagement.swift
+++ b/Sources/KlaviyoSwift/StateManagement/StateManagement.swift
@@ -320,7 +320,7 @@ struct KlaviyoReducer: ReducerProtocol {
                 state.flushing = false
                 return .none
             }
-            return .task { .sendRequest }
+            return .task { .sendRequest }.cancellable(id: RequestId.self)
 
         case .sendRequest:
             guard case .initialized = state.initalizationState else {
diff --git a/Tests/KlaviyoCoreTests/TestUtils.swift b/Tests/KlaviyoCoreTests/TestUtils.swift
index 4f1c0c78..bdcd86b4 100644
--- a/Tests/KlaviyoCoreTests/TestUtils.swift
+++ b/Tests/KlaviyoCoreTests/TestUtils.swift
@@ -62,10 +62,10 @@ let TEST_FAILURE_JSON_INVALID_EMAIL = """
 """
 
 let SAMPLE_PROPERTIES = [
-    "blob": "blob",
-    "stuff": 2,
-    "hello": [
-        "sub": "dict"
+    "Blob": "blob",
+    "Stuff": 2,
+    "Hello": [
+        "Sub": "dict"
     ]
 ] as [String: Any]
 
@@ -142,7 +142,7 @@ extension NetworkSession {
     }
 }
 
-class TestJSONDecoder: JSONDecoder {
+class TestJSONDecoder: JSONDecoder, @unchecked Sendable {
     override func decode<T>(_: T.Type, from _: Data) throws -> T where T: Decodable {
         AppLifeCycleEvents.test as! T
     }
diff --git a/Tests/KlaviyoCoreTests/__Snapshots__/EncodableTests/testEventPayload.1.json b/Tests/KlaviyoCoreTests/__Snapshots__/EncodableTests/testEventPayload.1.json
index b7b9dc63..bc3bc2aa 100644
--- a/Tests/KlaviyoCoreTests/__Snapshots__/EncodableTests/testEventPayload.1.json
+++ b/Tests/KlaviyoCoreTests/__Snapshots__/EncodableTests/testEventPayload.1.json
@@ -25,19 +25,19 @@
         "App ID" : "com.klaviyo.fooapp",
         "App Name" : "FooApp",
         "App Version" : "1.2.3",
-        "blob" : "blob",
+        "Blob" : "blob",
         "Device ID" : "fe-fi-fo-fum",
         "Device Manufacturer" : "Orange",
         "Device Model" : "jPhone 1,1",
-        "hello" : {
-          "sub" : "dict"
+        "Hello" : {
+          "Sub" : "dict"
         },
         "OS Name" : "iOS",
         "OS Version" : "1.1.1",
         "Push Token" : "",
         "SDK Name" : "swift",
         "SDK Version" : "4.0.0",
-        "stuff" : 2
+        "Stuff" : 2
       },
       "time" : "2009-02-13T23:31:30Z",
       "unique_id" : "00000000-0000-0000-0000-000000000001"
diff --git a/Tests/KlaviyoSwiftTests/KlaviyoTestUtils.swift b/Tests/KlaviyoSwiftTests/KlaviyoTestUtils.swift
index 7fc8f603..da58ba59 100644
--- a/Tests/KlaviyoSwiftTests/KlaviyoTestUtils.swift
+++ b/Tests/KlaviyoSwiftTests/KlaviyoTestUtils.swift
@@ -56,13 +56,13 @@ extension KlaviyoEnvironment {
     }
 }
 
-class TestJSONDecoder: JSONDecoder {
+class TestJSONDecoder: JSONDecoder, @unchecked Sendable {
     override func decode<T>(_: T.Type, from _: Data) throws -> T where T: Decodable {
         KlaviyoState.test as! T
     }
 }
 
-class InvalidJSONDecoder: JSONDecoder {
+class InvalidJSONDecoder: JSONDecoder, @unchecked Sendable {
     override func decode<T>(_: T.Type, from _: Data) throws -> T where T: Decodable {
         throw KlaviyoDecodingError.invalidType
     }
diff --git a/Tests/KlaviyoSwiftTests/StateManagementEdgeCaseTests.swift b/Tests/KlaviyoSwiftTests/StateManagementEdgeCaseTests.swift
index 11cdddc6..c684432f 100644
--- a/Tests/KlaviyoSwiftTests/StateManagementEdgeCaseTests.swift
+++ b/Tests/KlaviyoSwiftTests/StateManagementEdgeCaseTests.swift
@@ -154,6 +154,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSetEmptyEmail() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -161,6 +162,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         _ = await store.send(.setEmail(""))
     }
 
+    @MainActor
     func testSetEmailWithWhiteSpace() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -199,6 +201,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSetEmptyExternalId() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -206,6 +209,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         _ = await store.send(.setExternalId(""))
     }
 
+    @MainActor
     func testSetExternalIdWithWhiteSpaces() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -243,6 +247,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testSetEmptyPhoneNumber() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -250,6 +255,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         _ = await store.send(.setPhoneNumber(""))
     }
 
+    @MainActor
     func testSetPhoneNumberWithWhiteSpaces() async throws {
         let initialState = INITIALIZED_TEST_STATE()
         let store = TestStore(initialState: initialState, reducer: KlaviyoReducer())
@@ -414,6 +420,7 @@ class StateManagementEdgeCaseTests: XCTestCase {
         await fulfillment(of: [expection])
     }
 
+    @MainActor
     func testSetProfileWithEmptyStringIdentifiers() async throws {
         let initialState = KlaviyoState(
             apiKey: TEST_API_KEY,