diff --git a/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/execution/datasources/v2/AddIndexExec.scala b/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/execution/datasources/v2/AddIndexExec.scala
index d52ef85b..a009c956 100755
--- a/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/execution/datasources/v2/AddIndexExec.scala
+++ b/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/execution/datasources/v2/AddIndexExec.scala
@@ -13,6 +13,8 @@
  */
 package org.apache.spark.sql.execution.datasources.v2
 
+import com.fasterxml.jackson.databind.ObjectMapper
+import com.fasterxml.jackson.databind.node.ObjectNode
 import org.apache.arrow.c.{ArrowArrayStream, Data}
 import org.apache.arrow.vector.VectorSchemaRoot
 import org.apache.arrow.vector.ipc.{ArrowStreamReader, ArrowStreamWriter}
@@ -24,8 +26,6 @@ import org.apache.spark.sql.types.StructType
 import org.apache.spark.sql.util.LanceArrowUtils
 import org.apache.spark.sql.util.LanceSerializeUtil.{decode, encode}
 import org.apache.spark.unsafe.types.UTF8String
-import org.json4s.JsonAST._
-import org.json4s.jackson.JsonMethods.{compact, render}
 import org.lance.{CommitBuilder, Dataset, Transaction}
 import org.lance.index.{Index, IndexOptions, IndexParams, IndexType}
 import org.lance.index.scalar.{BTreeIndexParams, ScalarIndexParams}
@@ -520,6 +520,8 @@ case class RangeBTreeIndexBuilder(
  */
 object IndexUtils {
 
+  private val jsonMapper = new ObjectMapper()
+
   /**
    * Build an [[IndexType]] from the given index method string.
    *
@@ -539,25 +541,25 @@ object IndexUtils {
     if (args.isEmpty) {
       "{}"
     } else {
-      val fields = args.map { a =>
-        val jv = a.value match {
-          case null => JNull
+      val node: ObjectNode = jsonMapper.createObjectNode()
+      args.foreach { a =>
+        a.value match {
+          case null => node.putNull(a.name)
           case s: java.lang.String =>
             val trimmed = s.stripPrefix("\"").stripSuffix("\"").stripPrefix("'").stripSuffix("'")
-            JString(trimmed)
-          case b: java.lang.Boolean => JBool(b.booleanValue())
-          case c: java.lang.Character => JString(String.valueOf(c))
-          case by: java.lang.Byte => JInt(BigInt(by.intValue()))
-          case sh: java.lang.Short => JInt(BigInt(sh.intValue()))
-          case i: java.lang.Integer => JInt(BigInt(i.intValue()))
-          case l: java.lang.Long => JInt(BigInt(l.longValue()))
-          case f: java.lang.Float => JDouble(f.doubleValue())
-          case d: java.lang.Double => JDouble(d.doubleValue())
-          case other => JString(String.valueOf(other))
+            node.put(a.name, trimmed)
+          case b: java.lang.Boolean => node.put(a.name, b.booleanValue())
+          case c: java.lang.Character => node.put(a.name, String.valueOf(c))
+          case by: java.lang.Byte => node.put(a.name, by.intValue())
+          case sh: java.lang.Short => node.put(a.name, sh.intValue())
+          case i: java.lang.Integer => node.put(a.name, i.intValue())
+          case l: java.lang.Long => node.put(a.name, l.longValue())
+          case f: java.lang.Float => node.put(a.name, f.doubleValue())
+          case d: java.lang.Double => node.put(a.name, d.doubleValue())
+          case other => node.put(a.name, String.valueOf(other))
         }
-        JField(a.name, jv)
       }
-      compact(render(JObject(fields.toList)))
+      jsonMapper.writeValueAsString(node)
     }
   }
 
diff --git a/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/util/LanceArrowUtils.scala b/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/util/LanceArrowUtils.scala
index 4c876da3..b45ec8a4 100644
--- a/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/util/LanceArrowUtils.scala
+++ b/lance-spark-base_2.12/src/main/scala/org/apache/spark/sql/util/LanceArrowUtils.scala
@@ -23,13 +23,12 @@ package org.apache.spark.sql.util
  * It has been modified by the Lance developers to fit the needs of the Lance project.
  */
 
+import com.fasterxml.jackson.databind.ObjectMapper
 import org.apache.arrow.vector.complex.MapVector
 import org.apache.arrow.vector.types.{DateUnit, FloatingPointPrecision, IntervalUnit, TimeUnit}
 import org.apache.arrow.vector.types.pojo.{ArrowType, Field, FieldType, Schema}
 import org.apache.spark.{SparkException, SparkUnsupportedOperationException}
 import org.apache.spark.sql.types._
-import org.json4s.{DefaultFormats, Formats}
-import org.json4s.JsonAST.{JObject, JString}
 import org.lance.spark.LanceConstant
 import org.lance.spark.utils.{BlobUtils, Float16Utils, LargeVarCharUtils, VectorUtils}
 
@@ -39,6 +38,9 @@ import java.util.concurrent.atomic.AtomicInteger
 import scala.collection.JavaConverters._
 
 object LanceArrowUtils {
+
+  private val mapper = new ObjectMapper()
+
   val ARROW_FIXED_SIZE_LIST_SIZE_KEY = VectorUtils.ARROW_FIXED_SIZE_LIST_SIZE_KEY
   val ARROW_FLOAT16_KEY = Float16Utils.ARROW_FLOAT16_KEY
   val ENCODING_BLOB = BlobUtils.LANCE_ENCODING_BLOB_KEY
@@ -157,8 +159,8 @@ object LanceArrowUtils {
           new MetadataBuilder()
             .putString(ARROW_LARGE_VAR_CHAR_KEY, "true")
             .build()
-        case _ => Metadata.fromJObject(
-            JObject(field.getMetadata.asScala.map { case (k, v) => (k, JString(v)) }.toList))
+        case _ => Metadata.fromJson(
+            mapper.writeValueAsString(field.getMetadata))
       }
       StructField(field.getName, dt, field.isNullable, metadata)
     }.toArray)
@@ -207,10 +209,9 @@ object LanceArrowUtils {
         large = true
       }
 
-      implicit val formats: Formats = DefaultFormats
-      meta = metadata.jsonValue.extract[Map[String, Object]].map { case (k, v) =>
-        (k, String.valueOf(v))
-      }
+      meta = mapper
+        .readValue(metadata.json, classOf[java.util.LinkedHashMap[_, _]])
+        .asScala.map { case (k, v) => (k.toString, String.valueOf(v)) }.toMap
     }
 
     dt match {