diff --git a/build.sbt b/build.sbt
index 635d7f4..0148995 100644
--- a/build.sbt
+++ b/build.sbt
@@ -24,7 +24,7 @@ val parserCombinatorsVersion = "2.5.0"
 val avsCommonsVersion = "2.29.0"
 val slf4jVersion = "2.0.19"
 val logbackVersion = "1.5.38" // Tests only
-val commonsLang3Version = "3.20.0"
+val commonsLang3Version = "3.21.0"
 val commonsCodecVersion = "1.22.1"
 val guavaVersion = "33.7.1-jre"
 val commonsNetVersion = "3.13.0"