diff --git a/build.gradle.kts b/build.gradle.kts
index db93b02..f27aca7 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -54,7 +54,7 @@ subprojects {
         set("spotBugsVersion", "4.7.3")         // https://mvnrepository.com/artifact/com.github.spotbugs/spotbugs-annotations
         set("classGraphVersion", "4.8.162")     // https://mvnrepository.com/artifact/io.github.classgraph/classgraph
 
-        set("log4jVersion", "2.20.0")           // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
+        set("log4jVersion", "2.21.1")           // https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core
         set("guavaVersion", "32.1.2-jre")         // https://mvnrepository.com/artifact/com.google.guava/guava
 
         set("junitVersion", "5.10.0")            // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api