diff --git a/Defaults.podspec b/Defaults.podspec
index c5f1c52..758a11a 100644
--- a/Defaults.podspec
+++ b/Defaults.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
 	s.name = 'Defaults'
-	s.version = '3.1.1'
+	s.version = '4.0.0'
 	s.summary = 'Swifty and modern UserDefaults'
 	s.license = 'MIT'
 	s.homepage = 'https://github.com/sindresorhus/Defaults'
diff --git a/Defaults.xcodeproj/project.pbxproj b/Defaults.xcodeproj/project.pbxproj
index 7bfbecb..ca2e543 100644
--- a/Defaults.xcodeproj/project.pbxproj
+++ b/Defaults.xcodeproj/project.pbxproj
@@ -734,7 +734,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -747,7 +747,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-iOS";
 				PRODUCT_NAME = Defaults;
@@ -765,7 +765,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -778,7 +778,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-iOS";
 				PRODUCT_NAME = Defaults;
 				SKIP_INSTALL = YES;
@@ -834,7 +834,7 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				"CODE_SIGN_IDENTITY[sdk=watchos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -846,7 +846,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-watchOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = watchos;
@@ -861,7 +861,7 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				"CODE_SIGN_IDENTITY[sdk=watchos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -873,7 +873,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-watchOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = watchos;
@@ -890,7 +890,7 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -902,7 +902,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-tvOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = appletvos;
@@ -917,7 +917,7 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				"CODE_SIGN_IDENTITY[sdk=appletvos*]" = "";
-				CURRENT_PROJECT_VERSION = 2;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -929,7 +929,7 @@
 					"@executable_path/Frameworks",
 					"@loader_path/Frameworks",
 				);
-				MARKETING_VERSION = 3.0.0;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-tvOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = appletvos;
@@ -947,7 +947,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CODE_SIGN_IDENTITY = "-";
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -961,7 +961,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.12;
-				MARKETING_VERSION = 3.1.1;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-macOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = macosx;
@@ -975,7 +975,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CODE_SIGN_IDENTITY = "-";
 				COMBINE_HIDPI_IMAGES = YES;
-				CURRENT_PROJECT_VERSION = 4;
+				CURRENT_PROJECT_VERSION = 5;
 				DEFINES_MODULE = YES;
 				DYLIB_COMPATIBILITY_VERSION = 1;
 				DYLIB_CURRENT_VERSION = 1;
@@ -989,7 +989,7 @@
 					"@loader_path/Frameworks",
 				);
 				MACOSX_DEPLOYMENT_TARGET = 10.12;
-				MARKETING_VERSION = 3.1.1;
+				MARKETING_VERSION = 4.0.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.Defaults.Defaults-macOS";
 				PRODUCT_NAME = Defaults;
 				SDKROOT = macosx;
diff --git a/readme.md b/readme.md
index 470ef52..04bc82c 100644
--- a/readme.md
+++ b/readme.md
@@ -30,7 +30,7 @@ It's used in production by apps like [Gifski](https://github.com/sindresorhus/Gi
 #### Swift Package Manager
 
 ```swift
-.package(url: "https://github.com/sindresorhus/Defaults", from: "3.1.1")
+.package(url: "https://github.com/sindresorhus/Defaults", from: "4.0.0")
 ```
 
 You need to set the build setting “Other Linker Flags” to `-weak_framework Combine` to work around [this Xcode bug](https://github.com/feedback-assistant/reports/issues/44).