diff --git a/fluency-treasuredata/build.gradle.kts b/fluency-treasuredata/build.gradle.kts
index bab7c7bb..c34df006 100644
--- a/fluency-treasuredata/build.gradle.kts
+++ b/fluency-treasuredata/build.gradle.kts
@@ -4,6 +4,6 @@ dependencies {
   implementation("com.treasuredata.client:td-client:1.1.1")
   implementation("com.google.guava:guava:33.1.0-jre")
   testImplementation("com.fasterxml.jackson.datatype:jackson-datatype-json-org:2.16.1")
-  testImplementation("com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.16.1")
+  testImplementation("com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.18.2")
   implementation("com.squareup.okhttp3:okhttp:3.14.9")
 }