diff --git a/Sources/ObservableStore/ObservableStore.swift b/Sources/ObservableStore/ObservableStore.swift
index ad6bbd3..999d27b 100644
--- a/Sources/ObservableStore/ObservableStore.swift
+++ b/Sources/ObservableStore/ObservableStore.swift
@@ -159,9 +159,9 @@ public struct Update<Model: ModelProtocol> {
 public protocol StoreProtocol {
     associatedtype Model: ModelProtocol
 
-    var state: Model { get }
+    @MainActor var state: Model { get }
 
-    func send(_ action: Model.Action) -> Void
+    @MainActor func send(_ action: Model.Action) -> Void
 }
 
 /// Store is a source of truth for a state.
@@ -172,6 +172,7 @@ public protocol StoreProtocol {
 /// Store has a `@Published` `state` (typically a struct).
 /// All updates and effects to this state happen through actions
 /// sent to `store.send`.
+@MainActor
 public final class Store<Model>: ObservableObject, StoreProtocol
 where Model: ModelProtocol
 {
@@ -312,6 +313,7 @@ where Model: ModelProtocol
     }
 }
 
+@MainActor
 public struct ViewStore<ViewModel: ModelProtocol>: StoreProtocol {
     private var _send: (ViewModel.Action) -> Void
     public var state: ViewModel
@@ -344,6 +346,7 @@ extension ViewStore {
 
 extension StoreProtocol {
     /// Create a viewStore from a StoreProtocol
+    @MainActor
     public func viewStore<ViewModel: ModelProtocol>(
         get: (Self.Model) -> ViewModel,
         tag: @escaping (ViewModel.Action) -> Self.Model.Action
@@ -387,6 +390,7 @@ extension Binding {
 }
 
 extension StoreProtocol {
+    @MainActor
     public func binding<Value>(
         get: @escaping (Self.Model) -> Value,
         tag: @escaping (Value) -> Self.Model.Action
diff --git a/Tests/ObservableStoreTests/BindingTests.swift b/Tests/ObservableStoreTests/BindingTests.swift
index 354f151..bd74a08 100644
--- a/Tests/ObservableStoreTests/BindingTests.swift
+++ b/Tests/ObservableStoreTests/BindingTests.swift
@@ -42,6 +42,7 @@ final class BindingTests: XCTestCase {
     }
     
     /// Test creating binding for an address
+    @MainActor
     func testBinding() throws {
         let store = Store(
             state: Model(),
@@ -70,6 +71,7 @@ final class BindingTests: XCTestCase {
     }
     
     /// Test creating binding for an address
+    @MainActor
     func testBindingMethod() throws {
         let store = Store(
             state: Model(),
diff --git a/Tests/ObservableStoreTests/ComponentMappingTests.swift b/Tests/ObservableStoreTests/ComponentMappingTests.swift
index 9309902..3f95bf9 100644
--- a/Tests/ObservableStoreTests/ComponentMappingTests.swift
+++ b/Tests/ObservableStoreTests/ComponentMappingTests.swift
@@ -126,6 +126,7 @@ class ComponentMappingTests: XCTestCase {
         }
     }
     
+    @MainActor
     func testForward() throws {
         let store = Store(
             state: ParentModel(),
@@ -150,6 +151,7 @@ class ComponentMappingTests: XCTestCase {
         )
     }
     
+    @MainActor
     func testKeyedCursorUpdate() throws {
         let store = Store(
             state: ParentModel(
@@ -185,6 +187,7 @@ class ComponentMappingTests: XCTestCase {
         )
     }
     
+    @MainActor
     func testCursorUpdate() throws {
         let store = Store(
             state: ParentModel(),
@@ -203,6 +206,7 @@ class ComponentMappingTests: XCTestCase {
         )
     }
     
+    @MainActor
     func testKeyedCursorUpdateMissing() throws {
         let store = Store(
             state: ParentModel(
diff --git a/Tests/ObservableStoreTests/ObservableStoreTests.swift b/Tests/ObservableStoreTests/ObservableStoreTests.swift
index 2abaafe..a383092 100644
--- a/Tests/ObservableStoreTests/ObservableStoreTests.swift
+++ b/Tests/ObservableStoreTests/ObservableStoreTests.swift
@@ -86,6 +86,7 @@ final class ObservableStoreTests: XCTestCase {
         self.cancellables = Set()
     }
     
+    @MainActor
     func testStateAdvance() throws {
         let store = Store(
             state: AppModel(),
@@ -100,6 +101,7 @@ final class ObservableStoreTests: XCTestCase {
     /// updates get removed from the cancellables array.
     /// 
     /// Failure to remove immediately-completing fx would cause a memory leak.
+    @MainActor
     func testEmptyFxRemovedOnComplete() {
         let store = Store(
             state: AppModel(),
@@ -133,6 +135,7 @@ final class ObservableStoreTests: XCTestCase {
     /// does not rely on an implementation detail of `Update` but instead
     /// tests this behavior directly, in case the implementation were to
     /// change somehow.
+    @MainActor
     func testEmptyFxThatCompleteImmiedatelyRemovedOnComplete() {
         let store = Store(
             state: AppModel(),
@@ -155,6 +158,7 @@ final class ObservableStoreTests: XCTestCase {
         wait(for: [expectation], timeout: 0.1)
     }
 
+    @MainActor
     func testAsyncFxRemovedOnComplete() {
         let store = Store(
             state: AppModel(),
@@ -176,6 +180,7 @@ final class ObservableStoreTests: XCTestCase {
         wait(for: [expectation], timeout: 0.5)
     }
     
+    @MainActor
     func testPublishedPropertyFires() throws {
         let store = Store(
             state: AppModel(),
@@ -207,6 +212,7 @@ final class ObservableStoreTests: XCTestCase {
         wait(for: [expectation], timeout: 0.2)
     }
     
+    @MainActor
     func testStateOnlySetWhenNotEqual() {
         let store = Store(
             state: AppModel(),
@@ -286,6 +292,7 @@ final class ObservableStoreTests: XCTestCase {
         var subtitle: String = ""
     }
     
+    @MainActor
     func testUpdateMergeFx() {
         let store = Store(
             state: TestUpdateMergeFxState(),
@@ -318,6 +325,7 @@ final class ObservableStoreTests: XCTestCase {
         wait(for: [expectation], timeout: 0.2)
     }
     
+    @MainActor
     func testCreateInit() throws {
         let store = Store(
             create: { environment in
@@ -343,6 +351,7 @@ final class ObservableStoreTests: XCTestCase {
         wait(for: [expectation], timeout: 0.1)
     }
 
+    @MainActor
     func testActionsPublisher() throws {
         let store = Store(
             state: AppModel(),
diff --git a/Tests/ObservableStoreTests/UpdateActionsTests.swift b/Tests/ObservableStoreTests/UpdateActionsTests.swift
index d53e111..c5942d9 100644
--- a/Tests/ObservableStoreTests/UpdateActionsTests.swift
+++ b/Tests/ObservableStoreTests/UpdateActionsTests.swift
@@ -69,6 +69,7 @@ class UpdateActionsTests: XCTestCase {
         }
     }
 
+    @MainActor
     func testUpdateActions() throws {
         let store = Store(
             state: TestModel(),
diff --git a/Tests/ObservableStoreTests/ViewStoreTests.swift b/Tests/ObservableStoreTests/ViewStoreTests.swift
index 9255356..6b0be9f 100644
--- a/Tests/ObservableStoreTests/ViewStoreTests.swift
+++ b/Tests/ObservableStoreTests/ViewStoreTests.swift
@@ -93,6 +93,7 @@ final class ViewStoreTests: XCTestCase {
     }
     
     /// Test creating binding for an address
+    @MainActor
     func testViewStore() throws {
         let store = Store(
             state: ParentModel(),
@@ -118,6 +119,7 @@ final class ViewStoreTests: XCTestCase {
     }
     
     /// Test creating binding for an address
+    @MainActor
     func testViewStoreMethod() throws {
         let store = Store(
             state: ParentModel(),