diff --git a/README.md b/README.md
index aa525d349..ef3bcf7f6 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# elasticsearch.js 15.1.0
+# elasticsearch.js 15.1.1
 
 The official low-level Elasticsearch client for Node.js and the browser.
 
diff --git a/docs/browser_builds.asciidoc b/docs/browser_builds.asciidoc
index 60a12d1e4..d3ed0248d 100644
--- a/docs/browser_builds.asciidoc
+++ b/docs/browser_builds.asciidoc
@@ -22,7 +22,7 @@ npm install elasticsearch-browser
 ---------
 
 === Download
- * v15.1.0: https://download.elasticsearch.org/elasticsearch/elasticsearch-js/elasticsearch-js-15.1.0.zip[zip], https://download.elasticsearch.org/elasticsearch/elasticsearch-js/elasticsearch-js-15.1.0.tar.gz[tar.gz]
+ * v15.1.1: https://download.elasticsearch.org/elasticsearch/elasticsearch-js/elasticsearch-js-15.1.1.zip[zip], https://download.elasticsearch.org/elasticsearch/elasticsearch-js/elasticsearch-js-15.1.1.tar.gz[tar.gz]
 
 === Angular Build
   * Registers an `esFactory` factory in the `"elasticsearch"` module
diff --git a/docs/changelog.asciidoc b/docs/changelog.asciidoc
index dff184a7f..a7c86648a 100644
--- a/docs/changelog.asciidoc
+++ b/docs/changelog.asciidoc
@@ -1,6 +1,9 @@
 [[changelog]]
 == Changelog
 
+=== 15.1.1 (July 3 2018)
+  * Fix JSON serialization bug affecting some objects with non-enumerable properties https://github.com/elastic/elasticsearch-js/issues/504[#504]
+
 === 15.1.0 (July 3 2018)
   * apiVersion `"6.3"` is now the default
 
diff --git a/package.json b/package.json
index aa3908051..1a5316a17 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
   "description": "The official low-level Elasticsearch client for Node.js and the browser.",
   "main": "src/elasticsearch.js",
   "homepage": "http://www.elastic.co/guide/en/elasticsearch/client/javascript-api/current/index.html",
-  "version": "15.1.0",
+  "version": "15.1.1",
   "keywords": [
     "elasticsearch",
     "mapping",