diff --git a/Sources/ContainerController/ContainerController.swift b/Sources/ContainerController/ContainerController.swift
index 3b5a13f..8863ab3 100644
--- a/Sources/ContainerController/ContainerController.swift
+++ b/Sources/ContainerController/ContainerController.swift
@@ -17,7 +17,7 @@ open class ContainerController: NSObject {
     
     public var shadowButton: UIButton!
     
-    public var controller: UIViewController?
+    public weak var controller: UIViewController?
     
     public var scrollView: UIScrollView?
     
@@ -31,7 +31,7 @@ open class ContainerController: NSObject {
     
     // MARK: Delegate
     
-    public var delegate: ContainerControllerDelegate?
+    public weak var delegate: ContainerControllerDelegate?
     
     // MARK: Current Move Type