diff --git a/pom.xml b/pom.xml
index 8929b5e..349fdec 100644
--- a/pom.xml
+++ b/pom.xml
@@ -73,6 +73,7 @@
 			<configuration>
 				<target>1.6</target>
 				<compilerArgument>-Xlint:unchecked</compilerArgument>
+				<compilerArgument>-Xlint:deprecation</compilerArgument>
 			</configuration>
 		</plugin>
 		<plugin>
diff --git a/src/main/java/net/vhati/modmanager/json/JacksonCatalogWriter.java b/src/main/java/net/vhati/modmanager/json/JacksonCatalogWriter.java
index 95fd0b1..c345a54 100644
--- a/src/main/java/net/vhati/modmanager/json/JacksonCatalogWriter.java
+++ b/src/main/java/net/vhati/modmanager/json/JacksonCatalogWriter.java
@@ -27,10 +27,10 @@ public class JacksonCatalogWriter {
 		ObjectNode rootNode = mapper.createObjectNode();
 
 		ObjectNode catalogsNode = rootNode.objectNode();
-		rootNode.put( "catalog_versions", catalogsNode );
+		rootNode.set( "catalog_versions", catalogsNode );
 
 		ArrayNode catalogNode = rootNode.arrayNode();
-		catalogsNode.put( "1", catalogNode );
+		catalogsNode.set( "1", catalogNode );
 
 		for ( ModsInfo modsInfo : modsInfoList ) {
 			ObjectNode infoNode = rootNode.objectNode();
@@ -44,7 +44,7 @@ public class JacksonCatalogWriter {
 			infoNode.put( "thread_hash", modsInfo.threadHash );
 
 			ArrayNode versionsNode = rootNode.arrayNode();
-			infoNode.put( "versions", versionsNode );
+			infoNode.set( "versions", versionsNode );
 
 			for ( Map.Entry<String,String> entry : modsInfo.getVersionsMap().entrySet() ) {
 				String versionFileHash = entry.getKey();