diff --git a/jentunnel-core/pom.xml b/jentunnel-core/pom.xml
index afa6d7b..f653434 100644
--- a/jentunnel-core/pom.xml
+++ b/jentunnel-core/pom.xml
@@ -17,7 +17,7 @@
 		<projectRoot>${project.basedir}/..</projectRoot>
 		<slf4j.version>1.7.36</slf4j.version>
 		<packer.version>1.1.2</packer.version>
-		<yaml.version>1.33</yaml.version>
+		<yaml.version>2.3</yaml.version>
 		<mina.version>2.1.6</mina.version>
 		<sshd.version>2.8.0</sshd.version>
 		<commons-codec.version>1.15</commons-codec.version>
diff --git a/jentunnel-core/src/main/java/org/javastack/jentunnel/ConfigUtils.java b/jentunnel-core/src/main/java/org/javastack/jentunnel/ConfigUtils.java
index f5b7575..2d3d641 100644
--- a/jentunnel-core/src/main/java/org/javastack/jentunnel/ConfigUtils.java
+++ b/jentunnel-core/src/main/java/org/javastack/jentunnel/ConfigUtils.java
@@ -11,6 +11,7 @@
 
 import org.yaml.snakeyaml.DumperOptions;
 import org.yaml.snakeyaml.DumperOptions.LineBreak;
+import org.yaml.snakeyaml.LoaderOptions;
 import org.yaml.snakeyaml.TypeDescription;
 import org.yaml.snakeyaml.Yaml;
 import org.yaml.snakeyaml.constructor.Constructor;
@@ -77,7 +78,7 @@ protected static Yaml getYaml() {
 		options.setAllowUnicode(false);
 		options.setIndicatorIndent(2);
 		options.setIndent(4);
-		final Constructor constructor = new Constructor(ConfigData.class);
+		final Constructor constructor = new Constructor(ConfigData.class, new LoaderOptions());
 		final Representer representer = new Representer(options);
 		for (final Entry<Class<?>, String> e : map.entrySet()) {
 			constructor.addTypeDescription(new TypeDescription(e.getKey(), e.getValue()));