diff --git a/Rakefile b/Rakefile
index c5939e6b..58f4da97 100644
--- a/Rakefile
+++ b/Rakefile
@@ -5,7 +5,7 @@ end
 desc 'Clean, build and test SWXMLHash'
 task :test do |_t|
   # xctool_build_cmd = './scripts/build.sh'
-  xcode_build_cmd = 'xcodebuild -workspace SWXMLHash.xcworkspace -scheme "SWXMLHash iOS" -destination "OS=10.3,name=iPhone 6S" clean build test -sdk iphonesimulator | xcpretty'
+  xcode_build_cmd = 'xcodebuild -workspace SWXMLHash.xcworkspace -scheme "SWXMLHash iOS" -destination "OS=11.0,name=iPhone 7" clean build test -sdk iphonesimulator | xcpretty'
 
   #if system('which xctool')
     #run xctool_build_cmd
diff --git a/SWXMLHash.xcodeproj/project.pbxproj b/SWXMLHash.xcodeproj/project.pbxproj
index 5d600179..152985fe 100644
--- a/SWXMLHash.xcodeproj/project.pbxproj
+++ b/SWXMLHash.xcodeproj/project.pbxproj
@@ -476,11 +476,11 @@
 				TargetAttributes = {
 					CD6083EE196CA106000B4F8D = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 					};
 					CD6083F9196CA106000B4F8D = {
 						CreatedOnToolsVersion = 6.0;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0900;
 						TestTargetID = CD6083EE196CA106000B4F8D;
 					};
 					CD9D052B1A757D8B003CCB21 = {
@@ -747,6 +747,7 @@
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
@@ -798,6 +799,7 @@
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 				SWIFT_VERSION = 3.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
@@ -826,7 +828,8 @@
 				PRODUCT_NAME = SWXMLHash;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -850,7 +853,8 @@
 				PRODUCT_NAME = SWXMLHash;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -870,7 +874,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "drmohundro.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -887,7 +892,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "drmohundro.${PRODUCT_NAME:rfc1034identifier}";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/Scripts/build.sh b/Scripts/build.sh
index db38d7fd..ac58a117 100755
--- a/Scripts/build.sh
+++ b/Scripts/build.sh
@@ -3,4 +3,4 @@
 set -ev
 
 #xctool -scheme "SWXMLHash iOS" clean build test -sdk iphonesimulator
-set -o pipefail && xcodebuild -workspace SWXMLHash.xcworkspace -scheme "SWXMLHash iOS" -destination "OS=10.3,name=iPhone 6S" clean build test -sdk iphonesimulator | xcpretty
+set -o pipefail && xcodebuild -workspace SWXMLHash.xcworkspace -scheme "SWXMLHash iOS" -destination "OS=11.0,name=iPhone 7" clean build test -sdk iphonesimulator | xcpretty