[MINOR] Jackson Version fit to spark 2.1
diff --git a/pom.xml b/pom.xml
index 3c3bc07..5f3da30 100644
--- a/pom.xml
+++ b/pom.xml
@@ -981,7 +981,7 @@
 		<dependency>
 			<groupId>com.fasterxml.jackson.core</groupId>
 			<artifactId>jackson-databind</artifactId>
-			<version>2.11.3</version>
+			<version>2.6.5</version>
 		</dependency>
 
 		<dependency>