diff --git a/.travis.yml b/.travis.yml
index 9520a81..fcb66c7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 language: objective-c
-osx_image: xcode8.1
+osx_image: xcode9.1
 branches:
   only:
     - master
@@ -9,9 +9,9 @@ env:
   global:
   - PROJECT_NAME="KeyboardHelper.xcodeproj"
   - IOS_FRAMEWORK_SCHEME="KeyboardHelper"
-  - IOS_SDK=iphonesimulator10.1
+  - IOS_SDK=iphonesimulator11.1
   matrix:
-  - DESTINATION="OS=10.1,name=iPhone 6S Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="YES"
+  - DESTINATION="OS=11.1,name=iPhone 6S Plus"     SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="YES"
 
 script:
   - set -o pipefail
diff --git a/KeyboardHelper.xcodeproj/project.pbxproj b/KeyboardHelper.xcodeproj/project.pbxproj
index 63f0f48..e7395fb 100644
--- a/KeyboardHelper.xcodeproj/project.pbxproj
+++ b/KeyboardHelper.xcodeproj/project.pbxproj
@@ -189,11 +189,11 @@
 				TargetAttributes = {
 					275BCA761C57C9F800FF3647 = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 					};
 					275BCA801C57C9F800FF3647 = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 					};
 				};
 			};
@@ -368,7 +368,8 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OBJC_INTERFACE_HEADER_NAME = "$(SWIFT_MODULE_NAME)-Swift.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -387,7 +388,8 @@
 				SKIP_INSTALL = YES;
 				SWIFT_OBJC_INTERFACE_HEADER_NAME = "$(SWIFT_MODULE_NAME)-Swift.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -398,7 +400,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.KeyboardHelperTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -410,7 +413,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.nodes.KeyboardHelperTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/KeyboardHelper/Classes/KeyboardHelper.swift b/KeyboardHelper/Classes/KeyboardHelper.swift
index 34c4d88..396e79f 100644
--- a/KeyboardHelper/Classes/KeyboardHelper.swift
+++ b/KeyboardHelper/Classes/KeyboardHelper.swift
@@ -55,12 +55,12 @@ public class KeyboardHelper {
         delegate = nil
     }
     
-    dynamic private func keyboardWillAppear(_ note: Notification) {
+    @objc dynamic private func keyboardWillAppear(_ note: Notification) {
         let info = KeyboardAppearanceInfo(notification: note)
         self.delegate?.keyboardWillAppear(info)
     }
     
-    dynamic private func keyboardWillDisappear(_ note: Notification) {
+    @objc dynamic private func keyboardWillDisappear(_ note: Notification) {
         let info = KeyboardAppearanceInfo(notification: note)
         self.delegate?.keyboardWillDisappear(info)
     }