diff --git a/.swift-version b/.swift-version
index bf77d549..819e07a2 100644
--- a/.swift-version
+++ b/.swift-version
@@ -1 +1 @@
-4.2
+5.0
diff --git a/CocoaMQTT.podspec b/CocoaMQTT.podspec
index 061b64f4..b5c84792 100644
--- a/CocoaMQTT.podspec
+++ b/CocoaMQTT.podspec
@@ -1,18 +1,18 @@
 Pod::Spec.new do |s|
   s.name        = "CocoaMQTT"
-  s.version     = "1.1.3"
-  s.summary     = "MQTT v3.1.1 client library for iOS and OS X written with Swift 4"
+  s.version     = "1.2.0"
+  s.summary     = "MQTT v3.1.1 client library for iOS and OS X written with Swift 5"
   s.homepage    = "https://github.com/emqtt/CocoaMQTT"
   s.license     = { :type => "MIT" }
   s.authors     = { "Feng Lee" => "feng@emqtt.io", "CrazyWisdom" => "zh.whong@gmail.com", "Alex Yu" => "alexyu.dc@gmail.com" }
 
-  s.swift_version = "4.2"
+  s.swift_version = "5.0"
   s.requires_arc = true
   s.osx.deployment_target = "10.9"
   s.ios.deployment_target = "8.0"
   s.tvos.deployment_target = "9.0"
   # s.watchos.deployment_target = "2.0"
-  s.source   = { :git => "https://github.com/emqtt/CocoaMQTT.git", :tag => "1.1.3"}
+  s.source   = { :git => "https://github.com/emqtt/CocoaMQTT.git", :tag => "1.2.0"}
   s.source_files = "Source/{*.h}", "Source/*.swift"
   s.dependency "CocoaAsyncSocket", "~> 7.6.3"
 end
diff --git a/README.md b/README.md
index e5b326bc..cb3d06e8 100644
--- a/README.md
+++ b/README.md
@@ -35,11 +35,13 @@ Install using [Carthage](https://github.com/Carthage/Carthage) by adding the fol
 github "robbiehanson/CocoaAsyncSocket" "master"
 github "emqtt/CocoaMQTT" "master"
 ````
+
 Then, run the following command:
 
 ```bash
 $ carthage update --platform iOS
 ```
+
 Last if you're building for OS X:
 
 - On your application targets “General” settings tab, in the “Embedded Binaries” section, drag and drop CocoaMQTT.framework from the Carthage/Build/Mac folder on disk.
@@ -52,6 +54,7 @@ If you're building for iOS, tvOS:
 `/usr/local/bin/carthage copy-frameworks`
 
 - and add the paths to the frameworks you want to use under “Input Files”, e.g.:
+
 ```
 $(SRCROOT)/Carthage/Build/iOS/CocoaMQTT.framework
 ```
@@ -129,6 +132,5 @@ MIT License (see `LICENSE`)
 
 ## Twitter
 
-
 https://twitter.com/emqtt