diff --git a/.travis.yml b/.travis.yml
index d20e916..3899a49 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,4 @@
-osx_image: xcode10.1
+osx_image: xcode10.2
 cache:
   - bundler: true
 install:
@@ -14,7 +14,7 @@ jobs:
     sudo: required
     dist: trusty
     env:
-      - SWIFT_VERSION=4.2
+      - SWIFT_VERSION=5.0
       - SWIFTENV_INSTALL="https://gist.githubusercontent.com/johnhammerlund/b4c3686e4270d463ef955c5a77f0b814/raw/9f442512a46d7a2af7b850d65a7e9bd31edfb09b/swiftenv-install.sh"
     install:
       - eval "$(curl -sL $SWIFTENV_INSTALL)"
@@ -28,6 +28,7 @@ jobs:
   - stage: Test
     name: "iOS"
     os: osx
+    sudo: required
     script:
       - rake test_ios
   - stage: Test
@@ -38,6 +39,7 @@ jobs:
   - stage: Test
     name: "tvOS"
     os: osx
+    sudo: required
     script:
       - rake test_tvos
   - stage: Test
diff --git a/Package.swift b/Package.swift
index 3637549..31a47e6 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,4 +1,4 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.0
 //
 //  Package.swift
 //  Relay
@@ -11,6 +11,12 @@ import PackageDescription
 
 let package = Package(
     name: "Relay",
+    platforms: [
+        .macOS(.v10_10),
+        .iOS(.v8),
+        .tvOS(.v9),
+        .watchOS(.v2),
+    ],
     products: [
         .library(
             name: "Relay",
diff --git a/Rakefile b/Rakefile
index e8c87e1..aa5fd35 100644
--- a/Rakefile
+++ b/Rakefile
@@ -7,7 +7,7 @@ def build_matrix
       :scheme => "#{$framework}-iOS",
       :run_tests => true,
       :destinations => [
-        "OS=9.3,name=iPhone 5s",
+        "OS=10.3.1,name=iPhone 5s",
         "OS=latest,name=iPad Air 2"
       ]
     },
@@ -22,7 +22,7 @@ def build_matrix
       :scheme => "#{$framework}-tvOS",
       :run_tests => true,
       :destinations => [
-        "OS=9.2,name=Apple TV 1080p",
+        "OS=10.2,name=Apple TV 1080p",
         "OS=latest,name=Apple TV 4K"
       ]
     },
diff --git a/Relay.xcodeproj/project.pbxproj b/Relay.xcodeproj/project.pbxproj
index 4f78d0f..a6ea63c 100644
--- a/Relay.xcodeproj/project.pbxproj
+++ b/Relay.xcodeproj/project.pbxproj
@@ -1136,7 +1136,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -1213,7 +1213,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -1297,7 +1297,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 4;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
@@ -1374,7 +1374,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 4;
 				VALIDATE_PRODUCT = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -1459,7 +1459,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -1536,7 +1536,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -1624,7 +1624,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -1702,7 +1702,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				VERSIONING_SYSTEM = "apple-generic";
 				VERSION_INFO_PREFIX = "";
 			};
@@ -1777,7 +1777,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -1844,7 +1844,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 			};
@@ -1918,7 +1918,7 @@
 				SDKROOT = appletvos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 			};
@@ -1985,7 +1985,7 @@
 				SDKROOT = appletvos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = 3;
 				TVOS_DEPLOYMENT_TARGET = 9.0;
 				VALIDATE_PRODUCT = YES;
@@ -2062,7 +2062,7 @@
 				SDKROOT = macosx;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -2129,7 +2129,7 @@
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};
diff --git a/RelayExampleIOS/RelayExampleIOS.xcodeproj/project.pbxproj b/RelayExampleIOS/RelayExampleIOS.xcodeproj/project.pbxproj
index 17ba7ac..9ed05f2 100644
--- a/RelayExampleIOS/RelayExampleIOS.xcodeproj/project.pbxproj
+++ b/RelayExampleIOS/RelayExampleIOS.xcodeproj/project.pbxproj
@@ -530,6 +530,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -584,6 +585,7 @@
 				SDKROOT = iphoneos;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				SWIFT_VERSION = 5.0;
 				VALIDATE_PRODUCT = YES;
 			};
 			name = Release;
@@ -600,7 +602,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOS;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Debug;
@@ -617,7 +619,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOS;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 			};
 			name = Release;
@@ -636,7 +638,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOSTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/RelayExampleIOS.app/RelayExampleIOS";
 			};
@@ -656,7 +658,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOSTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/RelayExampleIOS.app/RelayExampleIOS";
 			};
@@ -675,7 +677,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOSUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = RelayExampleIOS;
 			};
@@ -694,7 +696,7 @@
 				);
 				PRODUCT_BUNDLE_IDENTIFIER = com.mindbodyonline.RelayExampleIOSUITests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 				TARGETED_DEVICE_FAMILY = "1,2";
 				TEST_TARGET_NAME = RelayExampleIOS;
 			};