diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0444632..afa0407 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+<a name="4.0.4"></a>
+## 4.0.4 (2018-11-06)
+
+* Ensure indexOf is a function ([eeb3b80](https://github.com/achojs/acho/commit/eeb3b80))
+
+
+
 <a name="4.0.3"></a>
 ## 4.0.3 (2018-09-22)
 
diff --git a/package.json b/package.json
index 69b52e0..0700be7 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "acho",
   "description": "The Hackable Log",
   "homepage": "https://acho.js.org",
-  "version": "4.0.3",
+  "version": "4.0.4",
   "main": "./lib/Acho.js",
   "author": {
     "email": "josefrancisco.verdu@gmail.com",