diff --git a/pom.xml b/pom.xml
index 66b3bf5..65f71f7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@ Elasticsearch beyonder provides automatic index, mapping, alias, template creati
     <properties>
         <elasticsearch.version>8.6.2</elasticsearch.version>
         <slf4j.version>2.0.7</slf4j.version>
-        <log4j.version>2.20.0</log4j.version>
+        <log4j.version>2.21.1</log4j.version>
         <commons.io.version>2.11.0</commons.io.version>
         <jackson.version>2.15.2</jackson.version>