diff --git a/Bridgecraft.xcodeproj/project.pbxproj b/Bridgecraft.xcodeproj/project.pbxproj
index 5f26a43..64a9be1 100644
--- a/Bridgecraft.xcodeproj/project.pbxproj
+++ b/Bridgecraft.xcodeproj/project.pbxproj
@@ -244,7 +244,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0920;
-				LastUpgradeCheck = 0920;
+				LastUpgradeCheck = 0930;
 				ORGANIZATIONNAME = "Tamas Lustyik";
 				TargetAttributes = {
 					E8106892200966D600229277 = {
@@ -347,6 +347,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -354,6 +355,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -404,6 +406,7 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -411,6 +414,7 @@
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
diff --git a/Package.swift b/Package.swift
index 423828d..f522ece 100755
--- a/Package.swift
+++ b/Package.swift
@@ -35,7 +35,7 @@ let package = Package(
     ],
     dependencies: [
         .package(url: "https://github.com/kylef/Commander.git", from: "0.8.0"),
-        .package(url: "https://github.com/jpsim/SourceKitten.git", .from("0.19.1")),
+        .package(url: "https://github.com/jpsim/SourceKitten.git", .from("0.20.0")),
         .package(url: "https://github.com/appsquickly/XcodeEditor.git", .branch("master")),
     ],
     targets: [