diff --git a/Cache.xcodeproj/project.pbxproj b/Cache.xcodeproj/project.pbxproj
index 4004aeb2..dab2439f 100644
--- a/Cache.xcodeproj/project.pbxproj
+++ b/Cache.xcodeproj/project.pbxproj
@@ -637,7 +637,8 @@
 					};
 					D5291D171C2837DB00B702C9 = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0900;
+						DevelopmentTeam = 55622V7SY7;
+						LastSwiftMigration = 1000;
 					};
 					D5291D5F1C283B5300B702C9 = {
 						CreatedOnToolsVersion = 7.2;
@@ -647,7 +648,8 @@
 					};
 					D5DC59DF1C20593E003BD79B = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
+						DevelopmentTeam = 55622V7SY7;
+						LastSwiftMigration = 1000;
 					};
 				};
 			};
@@ -1029,13 +1031,15 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = 55622V7SY7;
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				INFOPLIST_FILE = "$(SRCROOT)/Tests/iOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "no.hyper.Cache-iOS-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1043,12 +1047,14 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_MODULES = YES;
+				DEVELOPMENT_TEAM = 55622V7SY7;
 				FRAMEWORK_SEARCH_PATHS = "$(inherited)";
 				INFOPLIST_FILE = "$(SRCROOT)/Tests/iOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "no.hyper.Cache-iOS-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
@@ -1241,8 +1247,10 @@
 		D5DC59F51C20593E003BD79B /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				CODE_SIGN_IDENTITY = "iPhone Developer";
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
 				DEFINES_MODULE = YES;
+				DEVELOPMENT_TEAM = 55622V7SY7;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
@@ -1254,6 +1262,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = no.hyper.Cache;
 				PRODUCT_NAME = Cache;
 				SKIP_INSTALL = YES;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Debug;
 		};
@@ -1273,6 +1283,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = no.hyper.Cache;
 				PRODUCT_NAME = Cache;
 				SKIP_INSTALL = YES;
+				SWIFT_SWIFT3_OBJC_INFERENCE = On;
+				SWIFT_VERSION = 4.2;
 			};
 			name = Release;
 		};
diff --git a/Source/iOS/UIImage+Extensions.swift b/Source/iOS/UIImage+Extensions.swift
index abc8834c..dee0008b 100644
--- a/Source/iOS/UIImage+Extensions.swift
+++ b/Source/iOS/UIImage+Extensions.swift
@@ -23,7 +23,7 @@ extension UIImage {
   /// Convert to data
   func cache_toData() -> Data? {
     return hasAlpha
-      ? UIImagePNGRepresentation(self)
-      : UIImageJPEGRepresentation(self, 1.0)
+      ? self.pngData()
+      : self.jpegData(compressionQuality: 1.0)
   }
 }
diff --git a/Tests/Shared/TestHelper.swift b/Tests/Shared/TestHelper.swift
index ac2be5ac..ef4586f8 100644
--- a/Tests/Shared/TestHelper.swift
+++ b/Tests/Shared/TestHelper.swift
@@ -14,8 +14,8 @@ struct TestHelper {
 
   static func triggerApplicationEvents() {
     #if !os(macOS)
-      NotificationCenter.default.post(name: .UIApplicationDidEnterBackground, object: nil)
-      NotificationCenter.default.post(name: .UIApplicationWillTerminate, object: nil)
+      NotificationCenter.default.post(name: UIApplication.didEnterBackgroundNotification, object: nil)
+      NotificationCenter.default.post(name: UIApplication.willTerminateNotification, object: nil)
     #else
       NotificationCenter.default.post(name: NSApplication.willTerminateNotification, object: nil)
       NotificationCenter.default.post(name: NSApplication.didResignActiveNotification, object: nil)