diff --git a/README.md b/README.md
index a7ba249..24bbec4 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 Our custom configuration of Elasticsearch at SSENSE.
 Used by: https://hub.docker.com/r/ssense/elasticsearch/
 
-Based on Elasticsearch version 2.3
+Based on Elasticsearch version 5.2
 
 Provides the following modifications: