diff --git a/build.gradle.kts b/build.gradle.kts
index 9103ee5..7c08da0 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -39,7 +39,7 @@ subprojects {
         annotationProcessor("org.seasar.doma:doma-processor:${domaVersion}")
         implementation("org.seasar.doma:doma-core:${domaVersion}")
         implementation("org.seasar.doma:doma-slf4j:${domaVersion}")
-        runtimeOnly("ch.qos.logback:logback-classic:1.5.20")
+        runtimeOnly("ch.qos.logback:logback-classic:1.5.21")
         runtimeOnly("com.h2database:h2:2.4.240")
         testImplementation(platform("org.junit:junit-bom:5.14.1"))
         testImplementation("org.junit.jupiter:junit-jupiter-api")