diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b5e17a..ea48fd5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # waveform-data.js
 
+## v4.1.0 (2021/04/29)
+
+ * Added WaveformData.toArrayBuffer() method (@chrisn)
+ * Fixed TypeScript declarations (@wong2)
+
 ## v4.0.0 (2021/04/24)
 
  * Added disable_worker option to WaveformData.createFromAudio()
diff --git a/package-lock.json b/package-lock.json
index bbfe785..18ae787 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "waveform-data",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index 61d7ceb..5971590 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "waveform-data",
-  "version": "4.0.0",
+  "version": "4.1.0",
   "description": "Audio Waveform Data Manipulation API – resample, offset and segment waveform data in JavaScript",
   "main": "waveform-data.js",
   "types": "waveform-data.d.ts",