diff --git a/README.md b/README.md
index 88352f9..9534271 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,9 @@
 # HFCardCollectionViewLayout
 The HFCardCollectionViewLayout provides a card stack layout not quite similar like the apps Reminder and Wallet.
 
+## Requirements
+- Swift 4.2
+
 Features:
 
 - Many options, also within the InterfaceBuilder
diff --git a/Source/HFCardCollectionViewLayout.swift b/Source/HFCardCollectionViewLayout.swift
index 593c43a..793e757 100644
--- a/Source/HFCardCollectionViewLayout.swift
+++ b/Source/HFCardCollectionViewLayout.swift
@@ -540,8 +540,8 @@ open class HFCardCollectionViewLayout: UICollectionViewLayout, UIGestureRecogniz
     private func initializeCardCollectionViewLayout() {
         self.collectionViewIsInitialized = true
         
-        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
-        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidHide(_:)), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
+        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidHide(_:)), name: UIResponder.keyboardDidHideNotification, object: nil)
         
         self.collectionViewTapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(self.collectionViewTapGestureHandler))
         self.collectionViewTapGestureRecognizer?.delegate = self
@@ -1015,7 +1015,7 @@ open class HFCardCollectionViewLayout: UICollectionViewLayout, UIGestureRecogniz
                                 self.collectionView?.insertSubview(self.movingCardSnapshotCell!, belowSubview: belowCell)
                                 self.movingCardSnapshotCell?.layer.zPosition = belowCell.layer.zPosition
                             } else {
-                                self.collectionView?.sendSubview(toBack: self.movingCardSnapshotCell!)
+                                self.collectionView?.sendSubviewToBack(self.movingCardSnapshotCell!)
                             }
                         }
                     }
@@ -1078,7 +1078,7 @@ open class HFCardCollectionViewLayout: UICollectionViewLayout, UIGestureRecogniz
         self.invalidateScrollTimer()
         self.autoscrollDisplayLink = CADisplayLink(target: self, selector: #selector(self.autoscrollHandler(displayLink:)))
         self.autoscrollDirection = direction
-        self.autoscrollDisplayLink?.add(to: .main, forMode: .commonModes)
+        self.autoscrollDisplayLink?.add(to: .main, forMode: .common)
     }
     
     private func invalidateScrollTimer() {
@@ -1159,7 +1159,7 @@ open class HFCardCollectionViewLayout: UICollectionViewLayout, UIGestureRecogniz
         
         if(gestureRecognizer == self.revealedCardPanGestureRecognizer) {
             let velocity =  self.revealedCardPanGestureRecognizer?.velocity(in: self.revealedCardPanGestureRecognizer?.view)
-            let result = fabs(velocity!.y) > fabs(velocity!.x)
+            let result = abs(velocity!.y) > abs(velocity!.x)
             return result
         }
         return true