diff --git a/Sdifft.xcodeproj/project.pbxproj b/Sdifft.xcodeproj/project.pbxproj
index 3653b70..4f9ce4c 100644
--- a/Sdifft.xcodeproj/project.pbxproj
+++ b/Sdifft.xcodeproj/project.pbxproj
@@ -192,7 +192,7 @@
 				LastUpgradeCheck = 9999;
 				TargetAttributes = {
 					"Sdifft::SdifftTests" = {
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 					};
 				};
 			};
@@ -201,6 +201,7 @@
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
 			knownRegions = (
+				English,
 				en,
 			);
 			mainGroup = OBJ_5;
@@ -295,7 +296,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = Sdifft;
 			};
 			name = Debug;
@@ -320,7 +321,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = Sdifft;
 			};
 			name = Release;
@@ -392,7 +393,7 @@
 				OTHER_CFLAGS = "$(inherited)";
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = SdifftTests;
 			};
 			name = Debug;
@@ -411,7 +412,7 @@
 				OTHER_CFLAGS = "$(inherited)";
 				OTHER_LDFLAGS = "$(inherited)";
 				OTHER_SWIFT_FLAGS = "$(inherited)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGET_NAME = SdifftTests;
 			};
 			name = Release;
diff --git a/Tests/SdifftTests/NSAttributedString+DiffTests.swift b/Tests/SdifftTests/NSAttributedString+DiffTests.swift
index 4ba2405..a3b9492 100644
--- a/Tests/SdifftTests/NSAttributedString+DiffTests.swift
+++ b/Tests/SdifftTests/NSAttributedString+DiffTests.swift
@@ -44,18 +44,18 @@ extension NSAttributedString {
 
 class NSAttributedStringDiffTests: XCTestCase {
     let insertAttributes: [NSAttributedString.Key: Any] = [
-        .backgroundColor: UIColor.green
+        .backgroundColor: Color.green
     ]
 
     let deleteAttributes: [NSAttributedString.Key: Any] = [
-        .backgroundColor: UIColor.red,
+        .backgroundColor: Color.red,
         .strikethroughStyle: NSUnderlineStyle.single.rawValue,
-        .strikethroughColor: UIColor.red,
+        .strikethroughColor: Color.red,
         .baselineOffset: 0
     ]
 
     let sameAttributes: [NSAttributedString.Key: Any] = [
-        .foregroundColor: UIColor.black
+        .foregroundColor: Color.black
     ]
 
     func testAttributedString() {