diff --git a/preprocessing/pom.xml b/preprocessing/pom.xml
index 97fadd6f..f648ccda 100644
--- a/preprocessing/pom.xml
+++ b/preprocessing/pom.xml
@@ -132,7 +132,7 @@
 		<dependency>
 			<groupId>org.elasticsearch</groupId>
 			<artifactId>elasticsearch</artifactId>
-			<version>2.4.6</version>
+			<version>6.8.17</version>
 			<exclusions>
                 <exclusion>
                     <artifactId>lucene-analyzers-common</artifactId>