diff --git a/.travis.yml b/.travis.yml
index d4e133a..10437cf 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,3 @@
 language: swift
-osx_image: xcode10
+osx_image: xcode10.2
 script: xcodebuild test -project Defaults.xcodeproj -scheme Defaults-macOS
diff --git a/Defaults.podspec b/Defaults.podspec
index 95ffd5e..d78ed22 100644
--- a/Defaults.podspec
+++ b/Defaults.podspec
@@ -8,7 +8,7 @@ Pod::Spec.new do |s|
 	s.authors = { 'Sindre Sorhus' => 'sindresorhus@gmail.com' }
 	s.source = { :git => 'https://github.com/sindresorhus/Defaults.git', :tag => "v#{s.version}" }
 	s.source_files = 'Sources/*.swift'
-	s.swift_version = '4.2'
+	s.swift_version = '5'
 	s.macos.deployment_target = '10.12'
 	s.ios.deployment_target = '10.0'
 	s.tvos.deployment_target = '10.0'
diff --git a/Defaults.xcodeproj/project.pbxproj b/Defaults.xcodeproj/project.pbxproj
index 4a4b01f..648ce1a 100644
--- a/Defaults.xcodeproj/project.pbxproj
+++ b/Defaults.xcodeproj/project.pbxproj
@@ -359,7 +359,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0930;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = Defaults;
 				TargetAttributes = {
 					52D6D97B1BEFF229002C0205 = {
@@ -380,11 +380,11 @@
 					};
 					52D6DA0E1BF000BD002C0205 = {
 						CreatedOnToolsVersion = 7.1;
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 					};
 					DD7502791C68FCFC006590AF = {
 						CreatedOnToolsVersion = 7.2.1;
-						LastSwiftMigration = 1000;
+						LastSwiftMigration = 1020;
 					};
 					DD75028C1C690C7A006590AF = {
 						CreatedOnToolsVersion = 7.2.1;
@@ -394,10 +394,10 @@
 			};
 			buildConfigurationList = 52D6D9761BEFF229002C0205 /* Build configuration list for PBXProject "Defaults" */;
 			compatibilityVersion = "Xcode 10.0";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				en,
+				Base,
 			);
 			mainGroup = 52D6D9721BEFF229002C0205;
 			productRefGroup = 52D6D97D1BEFF229002C0205 /* Products */;
@@ -557,6 +557,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -618,6 +619,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
@@ -895,7 +897,7 @@
 				PRODUCT_NAME = Defaults;
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -924,7 +926,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};
@@ -942,7 +944,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-macOS-Tests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Debug;
 		};
@@ -962,7 +964,7 @@
 				SDKROOT = macosx;
 				SWIFT_COMPILATION_MODE = wholemodule;
 				SWIFT_OPTIMIZATION_LEVEL = "-O";
-				SWIFT_VERSION = 4.2;
+				SWIFT_VERSION = 5.0;
 			};
 			name = Release;
 		};
diff --git a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-iOS.xcscheme b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-iOS.xcscheme
index 25e659e..799f230 100644
--- a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-iOS.xcscheme
+++ b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-iOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-macOS.xcscheme b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-macOS.xcscheme
index be54dfd..6c18a07 100644
--- a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-macOS.xcscheme
+++ b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-macOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-tvOS.xcscheme b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-tvOS.xcscheme
index 9fb7166..4da6b6e 100644
--- a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-tvOS.xcscheme
+++ b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-tvOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-watchOS.xcscheme b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-watchOS.xcscheme
index 10ad550..b0e9b21 100644
--- a/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-watchOS.xcscheme
+++ b/Defaults.xcodeproj/xcshareddata/xcschemes/Defaults-watchOS.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0930"
+   LastUpgradeVersion = "1020"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Package.swift b/Package.swift
index 4bb76a4..380b9c3 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1,8 +1,14 @@
-// swift-tools-version:4.2
+// swift-tools-version:5.0
 import PackageDescription
 
 let package = Package(
 	name: "Defaults",
+	platforms: [
+		.macOS(.v10_12),
+		.iOS(.v10),
+		.tvOS(.v10),
+		.watchOS(.v3)
+	],
 	products: [
 		.library(
 			name: "Defaults",