diff --git a/build.gradle.kts b/build.gradle.kts
index bf5b578..2d5cd2d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -50,7 +50,7 @@ subprojects {
         set("creekVersion", "0.4.2-SNAPSHOT")
         set("spotBugsVersion", "4.6.0")         // https://mvnrepository.com/artifact/com.github.spotbugs/spotbugs-annotations
 
-        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", "32.1.3-jre")         // https://mvnrepository.com/artifact/com.google.guava/guava
         set("junitVersion", "5.10.0")            // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
         set("junitPioneerVersion", "2.1.0")     // https://mvnrepository.com/artifact/org.junit-pioneer/junit-pioneer