diff --git a/build.gradle b/build.gradle
index a7e5f0ba..02195c7c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -163,7 +163,7 @@ repositories {
 dependencies {
 
     def opensearchVersion = "${opensearch_version}"
-    def log4jVersion = "2.20.0"
+    def log4jVersion = "2.21.0"
     def nettyVersion = "4.1.99.Final"
     def jacksonDatabindVersion = "2.15.2"
     def guavaVersion = "32.1.2-jre"