diff --git a/build.gradle b/build.gradle
index dd7605d..7018bb8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -34,10 +34,13 @@ java {
 
 dependencies {
     compileOnly libs.embulk.spi
+    compileOnly libs.slf4j
+
     implementation libs.embulk.util.config
     implementation libs.embulk.util.file
     implementation platform(libs.jackson.bom)
     implementation libs.bundles.jackson
+    implementation libs.validation
 
     testImplementation libs.junit4
     testImplementation libs.embulk.core
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 47bab06..9352e8c 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -7,6 +7,10 @@ embulk-spi = "0.11"
 embulk-util-config = "0.5.0"
 embulk-util-file = "0.2.0"
 
+slf4j-api = "2.0.7"
+
+validation-api = "2.0.1.Final"
+
 # See https://github.com/FasterXML/jackson/wiki/Jackson-Releases for Jackson versions.
 #
 # We choose Jackson with the latest patch release of the latest open branch.
@@ -30,6 +34,8 @@ jackson-core = { group = "com.fasterxml.jackson.core", name = "jackson-core" }
 jackson-databind = { group = "com.fasterxml.jackson.core", name = "jackson-databind" }
 jackson-datatype-jdk8 = { group = "com.fasterxml.jackson.datatype", name = "jackson-datatype-jdk8" }
 junit4 = { group = "junit", name = "junit", version.ref = "junit4" }
+slf4j = { group = "org.slf4j", name = "slf4j-api", version.ref = "slf4j-api" }
+validation = { group = "javax.validation", name = "validation-api", version.ref = "validation-api" }
 
 [bundles]