diff --git a/GildedRose.xcodeproj/project.pbxproj b/GildedRose.xcodeproj/project.pbxproj
index bcf3940..e8957ac 100644
--- a/GildedRose.xcodeproj/project.pbxproj
+++ b/GildedRose.xcodeproj/project.pbxproj
@@ -24,6 +24,7 @@
 /* End PBXContainerItemProxy section */
 
 /* Begin PBXFileReference section */
+		177585EB20069D7C0057D202 /* README.md */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = net.daringfireball.markdown; path = README.md; sourceTree = "<group>"; };
 		E2F4C30B1B956315003632EA /* GildedRose.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = GildedRose.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		E2F4C3101B956315003632EA /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
 		E2F4C3151B956316003632EA /* GildedRoseTests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = GildedRoseTests.xctest; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -55,6 +56,7 @@
 		E2F4C3011B956315003632EA = {
 			isa = PBXGroup;
 			children = (
+				177585EB20069D7C0057D202 /* README.md */,
 				E2F4C30D1B956315003632EA /* GildedRose */,
 				E2F4C3191B956316003632EA /* GildedRoseTests */,
 				E2F4C30C1B956315003632EA /* Products */,
@@ -321,6 +323,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -340,6 +343,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.tomheinan.GildedRose;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -351,6 +355,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.tomheinan.GildedRoseTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -362,6 +367,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/../Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.tomheinan.GildedRoseTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -384,6 +390,7 @@
 				E2F4C3211B956316003632EA /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 		E2F4C3221B956316003632EA /* Build configuration list for PBXNativeTarget "GildedRoseTests" */ = {
 			isa = XCConfigurationList;
@@ -392,6 +399,7 @@
 				E2F4C3241B956316003632EA /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};
diff --git a/GildedRose/GildedRose.swift b/GildedRose/GildedRose.swift
index bbd571f..d38ded9 100644
--- a/GildedRose/GildedRose.swift
+++ b/GildedRose/GildedRose.swift
@@ -8,7 +8,7 @@
 
 public class GildedRose {
 
-    public static func updateQuality(items: Array<Item>) -> [Item] {
+    public static func updateQuality(_ items: [Item]) -> [Item] {
         var items = items
         for i in 0 ..< items.count {
             if items[i].name != "Aged Brie" && items[i].name != "Backstage passes to a TAFKAL80ETC concert" {
diff --git a/README.md b/README.md
index 2724076..9cd0700 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ cd gilded-rose-swift
 open GildedRose.xcodeproj/
 ```
 
-The master branch contains the starting point for the exercise. You'll need Xcode 7 to run the tests (and you can run them with the **&#x2318;U** shortcut by default).
+The master branch contains the starting point for the exercise. You'll need Xcode 9 to run the tests (and you can run them with the **&#x2318;U** shortcut by default).
 
 ## Original Text