diff --git a/query-ranking/pom.xml b/query-ranking/pom.xml
index ea7a54f..bc1e634 100644
--- a/query-ranking/pom.xml
+++ b/query-ranking/pom.xml
@@ -96,7 +96,7 @@
             <dependency>
                 <groupId>org.elasticsearch</groupId>
                 <artifactId>elasticsearch</artifactId>
-                <version>6.6.1</version>
+                <version>6.8.17</version>
             </dependency>
             <dependency>
                 <groupId>org.elasticsearch.client</groupId>