diff --git a/History.md b/History.md
index f35d542b..18eeb846 100644
--- a/History.md
+++ b/History.md
@@ -1,3 +1,7 @@
+v4.0.1 / 2021-2-24
+==========================
+* Fixed an issue where the optional axiosInstance passed as an option was ignored
+
 v4.0.0 / 2021-2-17
 ==========================
 * BREAKING: throws error when message is over 32kb #268
diff --git a/package.json b/package.json
index af7abecc..698df677 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "analytics-node",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "The hassle-free way to integrate analytics into any Node.js application",
   "license": "MIT",
   "repository": "segmentio/analytics-node",