diff --git a/BlueSocket.podspec b/BlueSocket.podspec
index 1a11815..87122f4 100644
--- a/BlueSocket.podspec
+++ b/BlueSocket.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name        = "BlueSocket"
-  s.version     = "0.12.51"
+  s.version     = "0.12.52"
   s.summary     = "Socket framework for Swift using the Swift Package Manager"
   s.homepage    = "https://github.com/IBM-Swift/BlueSocket"
   s.license     = { :type => "Apache License, Version 2.0" }
diff --git a/BlueSocket.xcodeproj/project.pbxproj b/BlueSocket.xcodeproj/project.pbxproj
index c8462dd..1724f83 100644
--- a/BlueSocket.xcodeproj/project.pbxproj
+++ b/BlueSocket.xcodeproj/project.pbxproj
@@ -221,14 +221,16 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0810;
+				LastUpgradeCheck = 0900;
 				ORGANIZATIONNAME = IBM;
 				TargetAttributes = {
 					8C0F4BF51C4E84CC008B2B0A = {
 						CreatedOnToolsVersion = 7.2;
+						LastSwiftMigration = 0900;
 					};
 					8CA9B1621C98A00400E607FB = {
 						CreatedOnToolsVersion = 7.3;
+						LastSwiftMigration = 0900;
 					};
 					8CC36DF61C4EA1BE00BAA659 = {
 						DevelopmentTeam = 2ZB889ETZ7;
@@ -329,14 +331,20 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				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_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -380,14 +388,20 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				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_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
diff --git a/README.md b/README.md
index 9966598..0e23abf 100644
--- a/README.md
+++ b/README.md
@@ -20,16 +20,19 @@ Socket framework for Swift using the Swift Package Manager. Works on iOS, macOS,
 
 * Swift Open Source `swift-3.0.1-RELEASE` toolchain (**Minimum REQUIRED for latest release**)
 * Swift Open Source `swift-3.1.1-RELEASE` toolchain (**Recommended**)
+* Swift toolchain included in *Xcode Version 9.0 beta (9M136h) or higher*.
 
 ### macOS
 
 * macOS 10.11.6 (*El Capitan*) or higher
 * Xcode Version 8.3.2 (8E2002) or higher using one of the above toolchains (*Recommended*)
+* Xcode Version 9.0 beta (9M136h) or higher using the included toolchain.
 
 ### iOS
 
 * iOS 10.0 or higher
 * Xcode Version 8.3.2 (8E2002) or higher using one of the above toolchains (*Recommended*)
+* Xcode Version 9.0 beta (9M136h) or higher using the included toolchain.
 
 ### Linux