diff --git a/Example/Gemini.xcodeproj/project.pbxproj b/Example/Gemini.xcodeproj/project.pbxproj
index 4a0ac76..5763011 100644
--- a/Example/Gemini.xcodeproj/project.pbxproj
+++ b/Example/Gemini.xcodeproj/project.pbxproj
@@ -296,11 +296,11 @@
 				TargetAttributes = {
 					607FACCF1AFB9204008FA782 = {
 						CreatedOnToolsVersion = 6.3.1;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 					};
 					607FACE41AFB9204008FA782 = {
 						CreatedOnToolsVersion = 6.3.1;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 						TestTargetID = 607FACCF1AFB9204008FA782;
 					};
@@ -573,7 +573,8 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -588,7 +589,8 @@
 				MODULE_NAME = ExampleApp;
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.demo.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -610,7 +612,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -628,7 +631,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "org.cocoapods.$(PRODUCT_NAME:rfc1034identifier)";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE_SPECIFIER = "";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/Example/Gemini/AppDelegate.swift b/Example/Gemini/AppDelegate.swift
index 9e621db..0088776 100644
--- a/Example/Gemini/AppDelegate.swift
+++ b/Example/Gemini/AppDelegate.swift
@@ -22,7 +22,7 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         window?.makeKeyAndVisible()
 
         UINavigationBar.appearance().tintColor = .white
-        UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.white]
+        UINavigationBar.appearance().titleTextAttributes = [NSAttributedStringKey.foregroundColor : UIColor.white]
         UINavigationBar.appearance().setBackgroundImage(image(of: UIColor.black.withAlphaComponent(0.75)), for: .default)
         UINavigationBar.appearance().shadowImage = UIImage()
 
diff --git a/Example/Gemini/ViewControllers/CircleRotationViewController.swift b/Example/Gemini/ViewControllers/CircleRotationViewController.swift
index 46d8dc6..95c3820 100644
--- a/Example/Gemini/ViewControllers/CircleRotationViewController.swift
+++ b/Example/Gemini/ViewControllers/CircleRotationViewController.swift
@@ -57,7 +57,7 @@ final class CircleRotationViewController: UIViewController {
         view.addGestureRecognizer(gesture)
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/CubeViewController.swift b/Example/Gemini/ViewControllers/CubeViewController.swift
index 53004cd..30ac71b 100644
--- a/Example/Gemini/ViewControllers/CubeViewController.swift
+++ b/Example/Gemini/ViewControllers/CubeViewController.swift
@@ -52,7 +52,7 @@ final class CubeViewController: UIViewController {
         view.addGestureRecognizer(gesture)
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/CustomAnimationViewController.swift b/Example/Gemini/ViewControllers/CustomAnimationViewController.swift
index 80a728a..4b9cc28 100644
--- a/Example/Gemini/ViewControllers/CustomAnimationViewController.swift
+++ b/Example/Gemini/ViewControllers/CustomAnimationViewController.swift
@@ -95,7 +95,7 @@ final class CustomAnimationViewController: UIViewController {
         }
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/PitchRotationViewController.swift b/Example/Gemini/ViewControllers/PitchRotationViewController.swift
index 517bdb8..117fda5 100644
--- a/Example/Gemini/ViewControllers/PitchRotationViewController.swift
+++ b/Example/Gemini/ViewControllers/PitchRotationViewController.swift
@@ -68,7 +68,7 @@ final class PitchRotationViewController: UIViewController {
         view.layer.insertSublayer(gradientLayer, at: 0)
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/RollRotationViewController.swift b/Example/Gemini/ViewControllers/RollRotationViewController.swift
index 717196a..200adb5 100644
--- a/Example/Gemini/ViewControllers/RollRotationViewController.swift
+++ b/Example/Gemini/ViewControllers/RollRotationViewController.swift
@@ -72,7 +72,7 @@ final class RollRotationViewController: UIViewController {
         super.viewDidAppear(animated)
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/ScaleAnimationViewController.swift b/Example/Gemini/ViewControllers/ScaleAnimationViewController.swift
index a8fb4b2..f12fa74 100644
--- a/Example/Gemini/ViewControllers/ScaleAnimationViewController.swift
+++ b/Example/Gemini/ViewControllers/ScaleAnimationViewController.swift
@@ -59,7 +59,7 @@ final class ScaleAnimationViewController: UIViewController {
         collectionView.decelerationRate = UIScrollViewDecelerationRateFast
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/ViewControllers/YawRotationViewController.swift b/Example/Gemini/ViewControllers/YawRotationViewController.swift
index f11adaf..9b54004 100644
--- a/Example/Gemini/ViewControllers/YawRotationViewController.swift
+++ b/Example/Gemini/ViewControllers/YawRotationViewController.swift
@@ -60,7 +60,7 @@ final class YawRotationViewController: UIViewController {
         collectionView.decelerationRate = UIScrollViewDecelerationRateFast
     }
 
-    func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
+    @objc func toggleNavigationBarHidden(_ gestureRecognizer: UITapGestureRecognizer) {
         let isNavigationBarHidden = navigationController?.isNavigationBarHidden ?? true
         navigationController?.setNavigationBarHidden(!isNavigationBarHidden, animated: true)
     }
diff --git a/Example/Gemini/Views/PlayerView.swift b/Example/Gemini/Views/PlayerView.swift
index e7d6388..35ab634 100644
--- a/Example/Gemini/Views/PlayerView.swift
+++ b/Example/Gemini/Views/PlayerView.swift
@@ -24,12 +24,12 @@ final class PlayerView: UIView {
 
     override init(frame: CGRect) {
         super.init(frame: frame)
-        playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
+        playerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
     }
 
     required init?(coder aDecoder: NSCoder) {
         super.init(coder: aDecoder)
-        playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
+        playerLayer.videoGravity = AVLayerVideoGravity.resizeAspectFill
     }
 
     func setVideoURL(_ url: URL) {
diff --git a/Example/Pods/Pods.xcodeproj/project.pbxproj b/Example/Pods/Pods.xcodeproj/project.pbxproj
index 2811602..31ec9ee 100644
--- a/Example/Pods/Pods.xcodeproj/project.pbxproj
+++ b/Example/Pods/Pods.xcodeproj/project.pbxproj
@@ -276,6 +276,14 @@
 			attributes = {
 				LastSwiftUpdateCheck = 0830;
 				LastUpgradeCheck = 0900;
+				TargetAttributes = {
+					3B4BBB868E64E3B1D09E4EE452616D9B = {
+						LastSwiftMigration = 0900;
+					};
+					FCD5AA9DE71943D0A20424568E1AAB6C = {
+						LastSwiftMigration = 0900;
+					};
+				};
 			};
 			buildConfigurationList = 2D8E8EC45A3A1A1D94AE762CB5028504 /* Build configuration list for PBXProject "Pods" */;
 			compatibilityVersion = "Xcode 3.2";
@@ -369,7 +377,8 @@
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -403,7 +412,8 @@
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -438,7 +448,8 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -585,7 +596,8 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
diff --git a/README.md b/README.md
index 48c2e0f..8325bfa 100644
--- a/README.md
+++ b/README.md
@@ -316,7 +316,7 @@ To run the example project, clone the repo, and run `pod install` from the Examp
 ## <a name="requirements"> Requirements
 
 - Xcode 9.0+
-- Swift 3.2
+- Swift 4.0
 
 ## <a name="installation"> Installation