diff --git a/elasticsearch/Dockerfile b/elasticsearch/Dockerfile
index 7d77e07..2ed9801 100644
--- a/elasticsearch/Dockerfile
+++ b/elasticsearch/Dockerfile
@@ -1,4 +1,4 @@
-ARG ELK_VERSION=7.5.1
+ARG ELK_VERSION
 FROM docker.elastic.co/elasticsearch/elasticsearch:${ELK_VERSION}
 
 EXPOSE 9200 9300
diff --git a/env-example b/env-example
index 95fbba5..2c17a89 100644
--- a/env-example
+++ b/env-example
@@ -920,4 +920,4 @@ GEARMAN_MYSQL_DB=Gearmand
 GEARMAN_MYSQL_TABLE=gearman_queue
 
 ### ELK Stack ##################################################
-ELK_VERSION=7.5.1
+ELK_VERSION=7.9.1
diff --git a/kibana/Dockerfile b/kibana/Dockerfile
index 46ef653..adce23c 100644
--- a/kibana/Dockerfile
+++ b/kibana/Dockerfile
@@ -1,4 +1,4 @@
-ARG ELK_VERSION=7.5.1
+ARG ELK_VERSION
 FROM docker.elastic.co/kibana/kibana:${ELK_VERSION}
 
 EXPOSE 5601
diff --git a/logstash/Dockerfile b/logstash/Dockerfile
index 1a1a753..cc862b2 100644
--- a/logstash/Dockerfile
+++ b/logstash/Dockerfile
@@ -1,4 +1,4 @@
-ARG ELK_VERSION=7.5.1
+ARG ELK_VERSION
 FROM docker.elastic.co/logstash/logstash:${ELK_VERSION}
 
 USER root