diff --git a/Source/OverlayContainer/Internal/Extensions/UIViewController+Children.swift b/Source/OverlayContainer/Internal/Extensions/UIViewController+Children.swift
index 85726bf..0db276c 100644
--- a/Source/OverlayContainer/Internal/Extensions/UIViewController+Children.swift
+++ b/Source/OverlayContainer/Internal/Extensions/UIViewController+Children.swift
@@ -7,6 +7,7 @@
 
 import UIKit
 
+@MainActor
 extension UIViewController {
     func addChild(_ child: UIViewController, in containerView: UIView) {
         guard containerView.isDescendant(of: view) else { return }
diff --git a/Source/OverlayContainer/Internal/HeightContraintOverlayTranslationController.swift b/Source/OverlayContainer/Internal/HeightContraintOverlayTranslationController.swift
index 7e27d62..4ac06c6 100644
--- a/Source/OverlayContainer/Internal/HeightContraintOverlayTranslationController.swift
+++ b/Source/OverlayContainer/Internal/HeightContraintOverlayTranslationController.swift
@@ -36,6 +36,7 @@ protocol HeightConstraintOverlayTranslationControllerDelegate: AnyObject {
     func translationControllerDidScheduleTranslations(_ translationController: OverlayTranslationController)
 }
 
+@MainActor
 class HeightConstraintOverlayTranslationController: OverlayTranslationController {
 
     weak var delegate: HeightConstraintOverlayTranslationControllerDelegate?
diff --git a/Source/OverlayContainer/Internal/InterruptibleAnimatorOverlayContainerTransitionCoordinator.swift b/Source/OverlayContainer/Internal/InterruptibleAnimatorOverlayContainerTransitionCoordinator.swift
index c81e872..cee6564 100644
--- a/Source/OverlayContainer/Internal/InterruptibleAnimatorOverlayContainerTransitionCoordinator.swift
+++ b/Source/OverlayContainer/Internal/InterruptibleAnimatorOverlayContainerTransitionCoordinator.swift
@@ -7,6 +7,7 @@
 
 import UIKit
 
+@MainActor
 class InterruptibleAnimatorOverlayContainerTransitionCoordinator: OverlayContainerTransitionCoordinator {
 
     private let animator: UIViewImplicitlyAnimating