diff --git a/.travis.yml b/.travis.yml
index 18d84d204..b55542832 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -113,7 +113,7 @@ jobs:
       os: osx
       osx_image: xcode11.3
       env:
-        - VERSION=3.2.1
+        - VERSION=3.3.0
       install:
         # install hub
         - wget https://github.com/github/hub/releases/download/v2.11.2/hub-darwin-amd64-2.11.2.tgz -O /tmp/hub-darwin-amd64-2.11.2.tgz && tar -xvf /tmp/hub-darwin-amd64-2.11.2.tgz -C /usr/local/opt && ln -s /usr/local/opt/hub-darwin-amd64-2.11.2/bin/hub /usr/local/bin/hub
@@ -130,7 +130,7 @@ jobs:
       os: osx
       osx_image: xcode11.3
       env:
-        - VERSION=3.2.1
+        - VERSION=3.3.0
       install:
         # install hub
         - wget https://github.com/github/hub/releases/download/v2.11.2/hub-darwin-amd64-2.11.2.tgz -O /tmp/hub-darwin-amd64-2.11.2.tgz && tar -xvf /tmp/hub-darwin-amd64-2.11.2.tgz -C /usr/local/opt && ln -s /usr/local/opt/hub-darwin-amd64-2.11.2/bin/hub /usr/local/bin/hub
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 64afcbc45..20bdc3210 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,27 @@
 # Optimizely Swift SDK Changelog
 
+## 3.3.0
+March 11, 2020
+
+This release includes an enhancement of SDK initialization API to enable SDK updated on cached datafile change. It also fixes known bugs.
+
+### New Features
+* Add an option for **synchronous** initialization to enable SDK immediately updated when a new datafile is cached. Unless this feature is enabled, by default, the cached datafile will be used only when the SDK re-starts in the next session. Note that this option is for **synchronous** initialization only. ([#297](https://github.com/optimizely/swift-sdk/pull/297))
+
+	```
+    // enable SDK update when a new datafile is cached
+    optimizelyClient.start(datafile: data, doUpdateConfigOnNewDatafile: true)
+    
+    // by default, this feature is disabled
+    optimizelyClient.start(datafile: data)
+	```
+
+### Bug Fixes
+* When a **synchronously**-initialized SDK enables background datafile polling and its datafile was changed in the server, the new datafile is cached but SDK is not dynamically updated. ([#297](https://github.com/optimizely/swift-sdk/pull/297))
+* When background datafile polling is enabled and app goes to background and comes back to foreground after some delays, datafile fetching is called multiple times back-to-back. ([#301](https://github.com/optimizely/swift-sdk/pull/301))
+* NotificationCenter can cause crashes when multiple threads add/call listeners simultaneously. ([#304](https://github.com/optimizely/swift-sdk/pull/304))
+
+
 ## 3.2.1
 January 16, 2020
 
diff --git a/README.md b/README.md
index 19e500fdd..5b4de0f36 100644
--- a/README.md
+++ b/README.md
@@ -28,18 +28,28 @@ up an Optimizely X project and start using the SDK.
  
 Please note below that _\<platform\>_ is used to represent the platform on which you are building your app. Currently, we support ```iOS``` and ```tvOS``` platforms.
 
+#### Swift Package Manager
+ Add the following line to the dependencies value of your _Package.swift_:
+
+```
+dependencies: [
+	.package(url: "https://github.com/optimizely/swift-sdk.git", 
+					.upToNextMinor(from: “3.3.0”))
+]
+```
+
 #### CocoaPods 
 1. Add the following lines to the _Podfile_:<pre>
-	```use_frameworks!```
-    ```pod 'OptimizelySwiftSDK', '~> 3.2.1'```
-    </pre>
+```use_frameworks!```
+```pod 'OptimizelySwiftSDK', '~> 3.3.0'```
+</pre>
 
 2. Run the following command: <pre>``` pod install ```</pre>
 
 Further installation instructions for Cocoapods: https://guides.cocoapods.org/using/getting-started.html
 
 #### Carthage
-1. Add the following lines to the _Cartfile_:<pre>```github "optimizely/swift-sdk" ~> 3.2.1```</pre>
+1. Add the following lines to the _Cartfile_:<pre>```github "optimizely/swift-sdk" ~> 3.3.0```</pre>
 
 2. Run the following command:<pre>```carthage update```</pre>
 
@@ -56,15 +66,6 @@ Further installation instructions for Cocoapods: https://guides.cocoapods.org/us
 
 Futher installation instructions for Carthage: https://github.com/Carthage/Carthage
 
-#### Swift Package Manager
- Add the following line to the dependencies value of your _Package.swift_:
-
-```
-dependencies: [
-    .package(url: "https://github.com/optimizely/swift-sdk.git", .upToNextMinor(from: “3.2.1”))
-]
-```
-
 ### Samples
 
 A sample code for SDK initialization and experiments: