diff --git a/log-appender/build.gradle.kts b/log-appender/build.gradle.kts
index 310556278c..6e1c6160a3 100644
--- a/log-appender/build.gradle.kts
+++ b/log-appender/build.gradle.kts
@@ -16,7 +16,7 @@ java {
 dependencies {
     // Slf4J / logback
     implementation("org.slf4j:slf4j-api:2.0.16")
-    implementation("ch.qos.logback:logback-core:1.5.8")
+    implementation("ch.qos.logback:logback-core:1.5.9")
     implementation("ch.qos.logback:logback-classic:1.5.8")
 
     // JUL to SLF4J bridge