diff --git a/platform/darwin/test/MGLSDKTestHelpers.swift b/platform/darwin/test/MGLSDKTestHelpers.swift
index 576e3da86..727d8bf0c 100644
--- a/platform/darwin/test/MGLSDKTestHelpers.swift
+++ b/platform/darwin/test/MGLSDKTestHelpers.swift
@@ -23,9 +23,9 @@ extension MGLSDKTestHelpers {
     class func protocolMethodDescriptions(_ p: Protocol) -> Set<String> {
         var methods = Set<String>()
         var methodCount = UInt32()
-        let methodDescriptionList: UnsafeMutablePointer<objc_method_description>! = protocol_copyMethodDescriptionList(p, false, true, &methodCount)
+        let methodDescriptionList = protocol_copyMethodDescriptionList(p, false, true, &methodCount)
         for i in 0..<Int(methodCount) {
-            let description: objc_method_description = methodDescriptionList[i]
+            let description = methodDescriptionList![i]
             XCTAssertNotNil(description.name?.description)
             methods.insert(description.name!.description)
         }
@@ -36,11 +36,16 @@ extension MGLSDKTestHelpers {
     class func classMethodDescriptions(_ cls: Swift.AnyClass) -> Set<String> {
         var methods = Set<String>()
         var methodCount = UInt32()
-        let methodList: UnsafeMutablePointer<Method?>! = class_copyMethodList(cls, &methodCount)
+        let methodList = class_copyMethodList(cls, &methodCount)
         for i in 0..<Int(methodCount) {
-            let method = methodList[i]
-            let selector : Selector = method_getName(method)
-            methods.insert(selector.description)
+            let method = methodList![i]
+            let selector = method_getName(method)
+            #if os(macOS)
+                methods.insert(selector.description)
+            #else
+                XCTAssertNotNil(selector)
+                methods.insert(selector!.description)
+            #endif
         }
         free(methodList)
         return methods
diff --git a/platform/macos/macos.xcodeproj/project.pbxproj b/platform/macos/macos.xcodeproj/project.pbxproj
index 5af3d17b5..2ae0ea3bc 100644
--- a/platform/macos/macos.xcodeproj/project.pbxproj
+++ b/platform/macos/macos.xcodeproj/project.pbxproj
@@ -1378,7 +1378,7 @@
 				TargetAttributes = {
 					DA839E911CC2E3400062CAFB = {
 						CreatedOnToolsVersion = 7.3;
-						LastSwiftMigration = 0830;
+						LastSwiftMigration = 0920;
 					};
 					DAAA17961CE13BAE00731EFE = {
 						CreatedOnToolsVersion = 7.3.1;
@@ -1388,7 +1388,7 @@
 					};
 					DAE6C3301CC30DB200DB3429 = {
 						CreatedOnToolsVersion = 7.3;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0920;
 					};
 				};
 			};
@@ -1885,7 +1885,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.mapbox.MapboxGL;
 				PRODUCT_NAME = "Mapbox GL";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -1900,7 +1900,7 @@
 				OTHER_CFLAGS = "-fvisibility=hidden";
 				PRODUCT_BUNDLE_IDENTIFIER = com.mapbox.MapboxGL;
 				PRODUCT_NAME = "Mapbox GL";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -2026,7 +2026,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "../darwin/test/test-Bridging-Header.h";
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -2053,7 +2053,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.mapbox.test;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OBJC_BRIDGING_HEADER = "../darwin/test/test-Bridging-Header.h";
-				SWIFT_VERSION = 3.0;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};