diff --git a/Sources/Yams/Constructor.swift b/Sources/Yams/Constructor.swift
index 236403f6..3c1af585 100644
--- a/Sources/Yams/Constructor.swift
+++ b/Sources/Yams/Constructor.swift
@@ -445,7 +445,7 @@ private extension Substring {
 extension Constructor {
     @available(*, unavailable, message: "Use `Constructor.ScalarMap` instead")
     public typealias Map = [Tag.Name: (Node) -> Any?]
-    
+
     @available(*, unavailable, message: "Use `Constructor.defaultScalarMap` instead")
     public static let defaultMap: ScalarMap = [:]
 }
diff --git a/Sources/Yams/Decoder.swift b/Sources/Yams/Decoder.swift
index 6c84727b..d9ff4906 100644
--- a/Sources/Yams/Decoder.swift
+++ b/Sources/Yams/Decoder.swift
@@ -88,9 +88,7 @@ private struct _Decoder: Decoder {
     }
 }
 
-private struct _KeyedDecodingContainer<K: CodingKey> : KeyedDecodingContainerProtocol {
-
-    typealias Key = K
+private struct _KeyedDecodingContainer<Key: CodingKey> : KeyedDecodingContainerProtocol {
 
     private let decoder: _Decoder
     private let mapping: Node.Mapping
diff --git a/Sources/Yams/Encoder.swift b/Sources/Yams/Encoder.swift
index b60dfb84..6f89e76e 100644
--- a/Sources/Yams/Encoder.swift
+++ b/Sources/Yams/Encoder.swift
@@ -146,8 +146,7 @@ private class _ReferencingEncoder: _Encoder {
     }
 }
 
-private struct _KeyedEncodingContainer<K: CodingKey> : KeyedEncodingContainerProtocol {
-    typealias Key = K
+private struct _KeyedEncodingContainer<Key: CodingKey> : KeyedEncodingContainerProtocol {
 
     private let encoder: _Encoder
 
diff --git a/Tests/YamsTests/EncoderTests.swift b/Tests/YamsTests/EncoderTests.swift
index e27c89e8..103c640c 100644
--- a/Tests/YamsTests/EncoderTests.swift
+++ b/Tests/YamsTests/EncoderTests.swift
@@ -13,7 +13,7 @@ import Yams
 // swiftlint:disable identifier_name line_length
 
 /// Tests are copied from https://github.com/apple/swift/blob/master/test/stdlib/TestJSONEncoder.swift
-class EncoderTests: XCTestCase {
+class EncoderTests: XCTestCase { // swiftlint:disable:this type_body_length
     // MARK: - Encoding Top-Level Empty Types
     func testEncodingTopLevelEmptyStruct() {
         let empty = EmptyStruct()
diff --git a/Yams.xcodeproj/CYaml_Info.plist b/Yams.xcodeproj/CYaml_Info.plist
deleted file mode 100644
index e04b80ea..00000000
--- a/Yams.xcodeproj/CYaml_Info.plist
+++ /dev/null
@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<plist version="1.0">
-<dict>
-  <key>CFBundleDevelopmentRegion</key>
-  <string>en</string>
-  <key>CFBundleExecutable</key>
-  <string>$(EXECUTABLE_NAME)</string>
-  <key>CFBundleIdentifier</key>
-  <string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-  <key>CFBundleInfoDictionaryVersion</key>
-  <string>6.0</string>
-  <key>CFBundleName</key>
-  <string>$(PRODUCT_NAME)</string>
-  <key>CFBundlePackageType</key>
-  <string>FMWK</string>
-  <key>CFBundleShortVersionString</key>
-  <string>0.1.7</string>
-  <key>CFBundleSignature</key>
-  <string>????</string>
-  <key>CFBundleVersion</key>
-  <string>$(CURRENT_PROJECT_VERSION)</string>
-  <key>NSPrincipalClass</key>
-  <string></string>
-</dict>
-</plist>
diff --git a/Yams.xcodeproj/project.pbxproj b/Yams.xcodeproj/project.pbxproj
index ccf3412a..42127b7c 100644
--- a/Yams.xcodeproj/project.pbxproj
+++ b/Yams.xcodeproj/project.pbxproj
@@ -289,7 +289,7 @@
 		OBJ_1 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 0900;
+				LastUpgradeCheck = 0930;
 				TargetAttributes = {
 					OBJ_45 = {
 						LastSwiftMigration = 0900;
@@ -402,11 +402,13 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				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_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
@@ -450,11 +452,13 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				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_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
@@ -492,20 +496,15 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				ENABLE_TESTABILITY = YES;
 				INFOPLIST_FILE = Yams.xcodeproj/Yams_Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
-				OTHER_LDFLAGS = "$(inherited)";
-				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = Yams;
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "";
-				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGET_NAME = Yams;
 				WARNING_CFLAGS = "-Wall";
 			};
@@ -516,20 +515,15 @@
 			buildSettings = {
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEFINES_MODULE = YES;
 				ENABLE_TESTABILITY = YES;
 				INFOPLIST_FILE = Yams.xcodeproj/Yams_Info.plist;
-				LD_RUNPATH_SEARCH_PATHS = "$(TOOLCHAIN_DIR)/usr/lib/swift/macosx";
-				OTHER_LDFLAGS = "$(inherited)";
-				OTHER_SWIFT_FLAGS = "$(inherited)";
 				PRODUCT_BUNDLE_IDENTIFIER = Yams;
 				PRODUCT_MODULE_NAME = "$(TARGET_NAME:c99extidentifier)";
 				PRODUCT_NAME = "$(TARGET_NAME:c99extidentifier)";
 				SKIP_INSTALL = YES;
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "";
-				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGET_NAME = Yams;
 				WARNING_CFLAGS = "-Wall";
 			};
@@ -540,13 +534,9 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				INFOPLIST_FILE = Yams.xcodeproj/YamsTests_Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "@loader_path/../Frameworks @loader_path/Frameworks";
-				OTHER_LDFLAGS = "$(inherited)";
-				OTHER_SWIFT_FLAGS = "$(inherited)";
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "";
-				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGET_NAME = YamsTests;
 			};
 			name = Debug;
@@ -556,13 +546,9 @@
 			buildSettings = {
 				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
 				INFOPLIST_FILE = Yams.xcodeproj/YamsTests_Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "@loader_path/../Frameworks @loader_path/Frameworks";
-				OTHER_LDFLAGS = "$(inherited)";
-				OTHER_SWIFT_FLAGS = "$(inherited)";
-				SWIFT_ACTIVE_COMPILATION_CONDITIONS = "";
-				SWIFT_SWIFT3_OBJC_INFERENCE = Off;
-				SWIFT_VERSION = 4.0;
 				TARGET_NAME = YamsTests;
 			};
 			name = Release;
diff --git a/Yams.xcodeproj/xcshareddata/xcschemes/Yams.xcscheme b/Yams.xcodeproj/xcshareddata/xcschemes/Yams.xcscheme
index 4e57e103..a632accc 100644
--- a/Yams.xcodeproj/xcshareddata/xcschemes/Yams.xcscheme
+++ b/Yams.xcodeproj/xcshareddata/xcschemes/Yams.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0900"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"