diff --git a/CHANGELOG.md b/CHANGELOG.md
index a9f08f5..e622133 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,11 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 
 
+## [0.11.0] - 2017-07-23
+### Changed
+- add output image's ContentType to S3 Object's parameters (previously defaulted to `application/octet-stream`) (#43, #44)
+
+
 ## [0.10.0] - 2017-07-02
 ### Added
 - added this CHANGELOG from @adieuadieu
diff --git a/package.json b/package.json
index 094a470..054faa5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serverless-sharp-image",
-  "version": "0.10.0",
+  "version": "0.10.1",
   "description": "Serverless-based Lambda function to resize images based on S3 events with the awesome Sharp library",
   "main": "handler.js",
   "engines": {
diff --git a/src/image.js b/src/image.js
index 0d8d133..c87c9f3 100644
--- a/src/image.js
+++ b/src/image.js
@@ -5,15 +5,24 @@ import { makeKey, decodeS3EventKey } from './utils'
 
 const { outputs } = config
 
-export default (async function processItem (
-  { eventName, s3: { object: { key: undecodedKey } } = { object: { key: false } } },
-) {
+const imageMimeTypes = {
+  jpeg: 'image/jpeg',
+  png: 'image/png',
+  webp: 'image/webp',
+  gif: 'image/gif',
+  svg: 'image/svg+xml',
+}
+
+export default (async function processItem ({
+  eventName,
+  s3: { object: { key: undecodedKey } } = { object: { key: false } },
+}) {
   const key = decodeS3EventKey(undecodedKey)
   console.log('Processing: ', key)
 
   if (eventName.split(':')[0] !== 'ObjectCreated') {
     throw new Error(
-      `Event does not contain a valid type (e.g. ObjectCreated). Invoked by event name: ${eventName}`,
+      `Event does not contain a valid type (e.g. ObjectCreated). Invoked by event name: ${eventName}`
     )
   }
 
@@ -26,7 +35,12 @@ export default (async function processItem (
   const context = { key, type }
 
   return Promise.all(
-    streams.map((stream, index) =>
-      upload(stream, { ...outputs[index].params, Key: makeKey(outputs[index].key, context) })),
+    streams.map(async (stream, index) =>
+      upload(stream, {
+        ContentType: imageMimeTypes[(await stream.metadata()).format],
+        ...outputs[index].params,
+        Key: makeKey(outputs[index].key, context),
+      })
+    )
   )
-});
+})