diff --git a/CHIPageControl.xcodeproj/project.pbxproj b/CHIPageControl.xcodeproj/project.pbxproj
index b9c0f16..cd59a24 100644
--- a/CHIPageControl.xcodeproj/project.pbxproj
+++ b/CHIPageControl.xcodeproj/project.pbxproj
@@ -165,7 +165,7 @@
 					4313A78B1E7A831E0015A568 = {
 						CreatedOnToolsVersion = 8.2.1;
 						DevelopmentTeam = 4J5NY3YD66;
-						LastSwiftMigration = 0820;
+						LastSwiftMigration = 0900;
 						ProvisioningStyle = Automatic;
 					};
 				};
@@ -335,7 +335,8 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -355,7 +356,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = lv.chi.CHIPageControl;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/CHIPageControl/Core/CHIBasePageControl.swift b/CHIPageControl/Core/CHIBasePageControl.swift
index 89a5257..1e858ec 100644
--- a/CHIPageControl/Core/CHIBasePageControl.swift
+++ b/CHIPageControl/Core/CHIBasePageControl.swift
@@ -109,7 +109,7 @@ import UIKit
         self.displayLink?.add(to: .current, forMode: .commonModes)
     }
 
-    internal func updateFrame() {
+    @objc internal func updateFrame() {
         self.animate()
     }