diff --git a/build.gradle b/build.gradle
index 7951253e..7ac2e81f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -134,7 +134,7 @@ repositories {
 
 ext {
   log4JVersion = "2.25.1"
-  logbackVersion = "1.5.18"
+  logbackVersion = "1.5.21"
 }
 
 ext['snakeyaml.version'] = '2.0'