diff --git a/build.gradle b/build.gradle
index d9ae7f3..ecaaa20 100644
--- a/build.gradle
+++ b/build.gradle
@@ -48,7 +48,7 @@ dependencies {
 
     // log
     implementation 'org.slf4j:slf4j-api:2.0.16'
-    testRuntimeOnly 'ch.qos.logback:logback-classic:1.5.8'
+    testRuntimeOnly 'ch.qos.logback:logback-classic:1.5.9'
 
     // test framework
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.11.2'