diff --git a/CHANGELOG.md b/CHANGELOG.md
index 315d7a0f..8c4a7152 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,55 @@
+# [4.0.0](https://github.com/vendia/serverless-express/compare/v3.3.5...v4.0.0) (2021-02-01)
+
+
+### Bug Fixes
+
+* **audit:** npm audit fix ([66b03e5](https://github.com/vendia/serverless-express/commit/66b03e57b2c3ec5447f457dfe3dd804acdfa8dc7))
+* add body parsing for lambda edge event source ([116949d](https://github.com/vendia/serverless-express/commit/116949d286d2e14fbc71c7811bb980b0a5b2ea20))
+* add Promise return type for proxy function ([#332](https://github.com/vendia/serverless-express/issues/332)) ([5b23f3c](https://github.com/vendia/serverless-express/commit/5b23f3c7f3086a61fe359d9ca338c7c27137bcce))
+* change logging to include a log key ([542d473](https://github.com/vendia/serverless-express/commit/542d47301bdfd0831e98dd443b6f4808010b30d0))
+* clean up sockets on EADDRINUSE server close ([e768599](https://github.com/vendia/serverless-express/commit/e7685999acff9ee10bee188e9d6629777bceb2d8))
+* dependabot alerts ([df60394](https://github.com/vendia/serverless-express/commit/df60394476116763c017faa0f44b72aefc559aa6))
+* fix API Gateway V2 header response ([90bad18](https://github.com/vendia/serverless-express/commit/90bad18762f0f9548c1a1edba6eaa6a5913409ab)), closes [#352](https://github.com/vendia/serverless-express/issues/352)
+* fix getRequestValuesFromEvent headers ([f915e94](https://github.com/vendia/serverless-express/commit/f915e9489b27ab77cfde55e4aa2c5b63737004e7))
+* fix Lambda@Edge event source ([95b0aa6](https://github.com/vendia/serverless-express/commit/95b0aa6df746c7bb6751dd48787c2490a8ac1704))
+* fix Lambda@Edge headers and body ([aabd9d3](https://github.com/vendia/serverless-express/commit/aabd9d3e23827b17215a2a0743d9720b70209aaf))
+* fix remoteAddress undefined on ALB event source ([a092233](https://github.com/vendia/serverless-express/commit/a0922331446d9045dd7cd5897ebb7820619afcbe))
+* log actual headers in SERVERLESS_EXPRESS:FORWARD_RESPONSE:EVENT_SOURCE_RESPONSE_PARAMS ([72f2ef5](https://github.com/vendia/serverless-express/commit/72f2ef52ee7ec98dd450e385925f353203c5a945))
+* make optional the property `binarySettings` of `ConfigureParams` in typings ([b08ee87](https://github.com/vendia/serverless-express/commit/b08ee8748eb198aeeb684ff83378aa63687d2675))
+* remove commitlint from travis ([7b12e56](https://github.com/vendia/serverless-express/commit/7b12e569c558c304f93fcb4e30f1533729468f2c))
+* remove Node.js 4 support ([713ad14](https://github.com/vendia/serverless-express/commit/713ad14d4dbd4a938d88764b4302c92b7898f336))
+* remove Node.js 4 support ([e01c9af](https://github.com/vendia/serverless-express/commit/e01c9af6ea34def7f648d22c0d863a46efa6f879))
+* remove winston dependency and add basic logger ([5bd6c2c](https://github.com/vendia/serverless-express/commit/5bd6c2c895f44c0e0b3d025202f59a7539d1b8a3))
+* transform lambda edge response headers to lower case ([922fec0](https://github.com/vendia/serverless-express/commit/922fec0ed38ebddf6887464414c111e4691e6bfb))
+* transform request header keys to lower case ([daa656b](https://github.com/vendia/serverless-express/commit/daa656bda160404b0d5009a832ef2565f7faed00))
+* update dependencies ([e705bc6](https://github.com/vendia/serverless-express/commit/e705bc6697d26d9348ae39ec9231fe2e3b629548))
+* update dependencies ([075e15b](https://github.com/vendia/serverless-express/commit/075e15b6bf2e887a83d9b070e369e6bb0e909a09))
+* update dependencies ([39c55eb](https://github.com/vendia/serverless-express/commit/39c55eb8feb980c3b8261d203686e2a2f453be86))
+
+
+### Features
+
+* add additional event mapping logic ([e5909b5](https://github.com/vendia/serverless-express/commit/e5909b58282e24aa6cf97b33fa1c782b4f27a589))
+* add custom mapping example ([fe99c85](https://github.com/vendia/serverless-express/commit/fe99c85704997343aded82b85c3cc0cbd936c34a))
+* add HTTP API (APIGW-V2) event source ([60cb8e1](https://github.com/vendia/serverless-express/commit/60cb8e1c0f43ea8dad8463c5c37cb4cd450617da))
+* add lambda edge support and example ([230c9c5](https://github.com/vendia/serverless-express/commit/230c9c59c7a67b441a81afc851d7fc9a2ca27e8a))
+* add logger ([e35a348](https://github.com/vendia/serverless-express/commit/e35a3484cd8da4b1bc436565ffe1e7318e3cf08a))
+* add multiValueHeader and multiValueQueryStringParameters ([7199aa5](https://github.com/vendia/serverless-express/commit/7199aa52d9af72b238c72253b56d3a2ed4766de9))
+* add respondWithErrors config ([53cf974](https://github.com/vendia/serverless-express/commit/53cf9744aef95de357330d29c02a0d17296c03c2))
+* add stripBasePath for custom domain names ([3a5c7ed](https://github.com/vendia/serverless-express/commit/3a5c7ed3d86950a321d3de75e49820394aa12c08))
+* auto-detect binary response and add binarySettings ([64a99dc](https://github.com/vendia/serverless-express/commit/64a99dca400ec2b7bc7487f1312a565a14b251b4))
+* call Express directly instead of via a proxy server running on a local socket ([a468c72](https://github.com/vendia/serverless-express/commit/a468c7242a94e38ea7b5283d6bccb66331ece069))
+* lay groundwork for different event sources ([2db86f2](https://github.com/vendia/serverless-express/commit/2db86f28f37658198d19654bbc8852843b65a9e7))
+* refactor and expose a new interface ([7de5d45](https://github.com/vendia/serverless-express/commit/7de5d454284522806bddee21c7ea4dd6636bba3b))
+* remove middleware and expose getCurrentLambdaInvoke method ([b56c13b](https://github.com/vendia/serverless-express/commit/b56c13bc43cdadf20abfde0f9de55a2fc64f537b))
+* use multiValueHeaders for requests and responses ([c5ce62f](https://github.com/vendia/serverless-express/commit/c5ce62f5674fac397fccac75b06d138144001e57))
+* use promise resolution by default ([a9c01a3](https://github.com/vendia/serverless-express/commit/a9c01a3581f486f9e226730a8f871d704faa4cb1))
+
+
+### BREAKING CHANGES
+
+* The new interface is backwards incompatible and includes new and simpler ways of configuring and using the package.
+
 <a name="3.3.5"></a>
 ## [3.3.5](https://github.com/awslabs/aws-serverless-express/compare/v3.3.4...v3.3.5) (2018-08-20)
 
diff --git a/package-lock.json b/package-lock.json
index 50c9bf12..25acc11e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@vendia/serverless-express",
-  "version": "4.0.0-rc.13",
+  "version": "4.0.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 0ee06093..27f9b68b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@vendia/serverless-express",
-  "version": "4.0.0-rc.13",
+  "version": "4.0.0",
   "description": "This library enables you to utilize AWS Lambda and Amazon API Gateway to respond to web and API requests using your existing Node.js application framework.",
   "keywords": [
     "aws",
@@ -106,4 +106,4 @@
       "path": "cz-conventional-changelog"
     }
   }
-}
\ No newline at end of file
+}