diff --git a/.swift-version b/.swift-version
index 7d5c902..819e07a 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-4.1
+5.0
diff --git a/.travis.yml b/.travis.yml
index d3df4f0..b9eae36 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,7 +5,7 @@ matrix:
   include:
     - os: osx
       language: objective-c
-      osx_image: xcode9.3
+      osx_image: xcode10.2
       before_install:
         - gem install xcpretty
       script:
diff --git a/Sources/LiteSupport/LiteError.swift b/Sources/LiteSupport/LiteError.swift
index 0d52d54..3207d41 100644
--- a/Sources/LiteSupport/LiteError.swift
+++ b/Sources/LiteSupport/LiteError.swift
@@ -1,6 +1,6 @@
 /// LiteError.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/ParallelExecutor.swift b/Sources/LiteSupport/ParallelExecutor.swift
index 0eab4b4..6b0e03a 100644
--- a/Sources/LiteSupport/ParallelExecutor.swift
+++ b/Sources/LiteSupport/ParallelExecutor.swift
@@ -1,6 +1,6 @@
 /// ParallelExecutor.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/Run.swift b/Sources/LiteSupport/Run.swift
index 3bff031..8ac68f7 100644
--- a/Sources/LiteSupport/Run.swift
+++ b/Sources/LiteSupport/Run.swift
@@ -1,6 +1,6 @@
 /// Run.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/RunLineParser.swift b/Sources/LiteSupport/RunLineParser.swift
index d76b9a6..611fb9e 100644
--- a/Sources/LiteSupport/RunLineParser.swift
+++ b/Sources/LiteSupport/RunLineParser.swift
@@ -1,6 +1,6 @@
 /// RunLineParser.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/String+CommonPrefix.swift b/Sources/LiteSupport/String+CommonPrefix.swift
index f1288dd..5df35d8 100644
--- a/Sources/LiteSupport/String+CommonPrefix.swift
+++ b/Sources/LiteSupport/String+CommonPrefix.swift
@@ -1,6 +1,6 @@
 /// String+CommonPrefix.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/Substitutor.swift b/Sources/LiteSupport/Substitutor.swift
index 4e6a681..678b4d4 100644
--- a/Sources/LiteSupport/Substitutor.swift
+++ b/Sources/LiteSupport/Substitutor.swift
@@ -1,6 +1,6 @@
 /// Substitutor.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
@@ -9,7 +9,7 @@ import Foundation
 import Dispatch
 
 public extension String {
-  public var quoted: String {
+  var quoted: String {
     return "\"\(self)\""
   }
 }
diff --git a/Sources/LiteSupport/TestFile.swift b/Sources/LiteSupport/TestFile.swift
index bee3e1b..1b4524f 100644
--- a/Sources/LiteSupport/TestFile.swift
+++ b/Sources/LiteSupport/TestFile.swift
@@ -1,6 +1,6 @@
 /// TestFile.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/TestRunner.swift b/Sources/LiteSupport/TestRunner.swift
index 35e608d..1946bfb 100644
--- a/Sources/LiteSupport/TestRunner.swift
+++ b/Sources/LiteSupport/TestRunner.swift
@@ -1,6 +1,6 @@
 /// TestRunner.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Sources/LiteSupport/TimeInterval+Formatting.swift b/Sources/LiteSupport/TimeInterval+Formatting.swift
index 710227b..5591a47 100644
--- a/Sources/LiteSupport/TimeInterval+Formatting.swift
+++ b/Sources/LiteSupport/TimeInterval+Formatting.swift
@@ -1,6 +1,6 @@
 ///  TimeInterval+Formatting.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.
diff --git a/Tests/LiteTests/LiteTests.swift b/Tests/LiteTests/LiteTests.swift
index ffb8142..fa4794d 100644
--- a/Tests/LiteTests/LiteTests.swift
+++ b/Tests/LiteTests/LiteTests.swift
@@ -1,6 +1,6 @@
 /// LiteTests.swift
 ///
-/// Copyright 2017, The Silt Language Project.
+/// Copyright 2017-2019, The Silt Language Project.
 ///
 /// This project is released under the MIT license, a copy of which is
 /// available in the repository.