diff --git a/PMKCoreLocation.xcodeproj/project.pbxproj b/PMKCoreLocation.xcodeproj/project.pbxproj
index c9511df..5ea2459 100644
--- a/PMKCoreLocation.xcodeproj/project.pbxproj
+++ b/PMKCoreLocation.xcodeproj/project.pbxproj
@@ -167,7 +167,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0800;
-				LastUpgradeCheck = 0930;
+				LastUpgradeCheck = 1020;
 				ORGANIZATIONNAME = "Max Howell";
 				TargetAttributes = {
 					63C7FFA61D5BEE09003BAE60 = {
@@ -184,11 +184,11 @@
 			};
 			buildConfigurationList = 63C7FFA11D5BEE09003BAE60 /* Build configuration list for PBXProject "PMKCoreLocation" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				English,
 				en,
+				Base,
 			);
 			mainGroup = 63C7FF9D1D5BEE09003BAE60;
 			productRefGroup = 63C7FFA81D5BEE09003BAE60 /* Products */;
@@ -256,6 +256,7 @@
 			baseConfigurationReference = 63CCF8171D5C11B500503216 /* Carthage.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
@@ -323,6 +324,7 @@
 			baseConfigurationReference = 63CCF8171D5C11B500503216 /* Carthage.xcconfig */;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_LOCALIZABILITY_NONLOCALIZED = YES;
 				CLANG_ANALYZER_NONNULL = YES;
 				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
 				CLANG_CXX_LIBRARY = "libc++";
diff --git a/PMKCoreLocation.xcodeproj/xcshareddata/xcschemes/PMKCoreLocation.xcscheme b/PMKCoreLocation.xcodeproj/xcshareddata/xcschemes/PMKCoreLocation.xcscheme
index 13e642b..f75a810 100644
--- a/PMKCoreLocation.xcodeproj/xcshareddata/xcschemes/PMKCoreLocation.xcscheme
+++ b/PMKCoreLocation.xcodeproj/xcshareddata/xcschemes/PMKCoreLocation.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/Sources/CLLocationManager+Promise.swift b/Sources/CLLocationManager+Promise.swift
index 83b4d5b..0095a2a 100644
--- a/Sources/CLLocationManager+Promise.swift
+++ b/Sources/CLLocationManager+Promise.swift
@@ -88,10 +88,14 @@ extension CLLocationManager {
             return auth().then(std)
         case .denied, .restricted:
             return Promise(error: PMKError.notAuthorized)
+      #if swift(>=5)
+        @unknown default:
+            fatalError()
+      #endif
         }
     }
 
-    @available(*, deprecated: 5.0, renamed: "requestLocation")
+    @available(*, deprecated, renamed: "requestLocation")
     public class func promise(_ requestAuthorizationType: RequestAuthorizationType = .automatic, satisfying block: ((CLLocation) -> Bool)? = nil) -> Promise<[CLLocation]> {
         return requestLocation(authorizationType: requestAuthorizationType, satisfying: block)
     }