diff --git a/gradle.lockfile b/gradle.lockfile
index 470b140..14feef6 100644
--- a/gradle.lockfile
+++ b/gradle.lockfile
@@ -1,5 +1,5 @@
 # This is a Gradle generated file for dependency locking.
 # Manual edits can break the build and are not advised.
 # This file is expected to be part of source control.
-org.embulk:embulk-util-rubytime:0.3.3=compileClasspath,runtimeClasspath
+org.embulk:embulk-util-rubytime:0.4.0=compileClasspath,runtimeClasspath
 empty=
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index d091ecf..e06227d 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -1,6 +1,6 @@
 [versions]
 
-embulk-util-rubytime = "0.3.3"
+embulk-util-rubytime = "0.4.0"
 
 joda-time = "2.12.7"