diff --git a/pom.xml b/pom.xml
index fb168675..33cc9aa3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -72,7 +72,7 @@
         <!-- Runtime dependencies (aligned with Spring Boot 3.5.7) -->
         <jackson.version>2.19.2</jackson.version>
         <slf4j.version>2.0.17</slf4j.version>
-        <logback.version>1.5.20</logback.version>
+        <logback.version>1.5.21</logback.version>
         <log4j2.version>2.24.3</log4j2.version>
         <servlet.api.version>6.0.0</servlet.api.version>