diff --git a/build.gradle b/build.gradle
index 2a8a2c1..2cc7e50 100644
--- a/build.gradle
+++ b/build.gradle
@@ -36,7 +36,7 @@ dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-webmvc'
     implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
     implementation 'org.commonmark:commonmark:0.29.0'
-    implementation 'org.apache.commons:commons-lang3:3.20.0'
+    implementation 'org.apache.commons:commons-lang3:3.21.0'
     runtimeOnly 'org.postgresql:postgresql'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'
     testImplementation 'org.springframework.boot:spring-boot-starter-data-jpa-test'