diff --git a/project/build.properties b/project/build.properties
index e64c208..46e43a9 100644
--- a/project/build.properties
+++ b/project/build.properties
@@ -1 +1 @@
-sbt.version=1.5.8
+sbt.version=1.8.2
diff --git a/src/main/scala/iog/psg/cardano/TxMetadataOut.scala b/src/main/scala/iog/psg/cardano/TxMetadataOut.scala
index 9175a3d..0b1eecf 100644
--- a/src/main/scala/iog/psg/cardano/TxMetadataOut.scala
+++ b/src/main/scala/iog/psg/cardano/TxMetadataOut.scala
@@ -52,6 +52,12 @@ final case class TxMetadataOut(json: Json) {
           case Some(ValueTypeBytes)  =>
             extractBytesField(cursor)
 
+          case Some(ValueTypeList) =>
+            extractListField(cursor, key)
+
+          case Some(ValueTypeMap) =>
+            extractMapField(cursor, key)
+
           case Some(valueType) => Left(DecodingFailure(s"Invalid type '$valueType'", List(DownField(key))))
 
           case None => Left(DecodingFailure("Missing value under key", List(DownField(key))))
diff --git a/src/test/scala/iog/psg/cardano/TxMetadataCodecSpec.scala b/src/test/scala/iog/psg/cardano/TxMetadataCodecSpec.scala
index 7cecda9..72579d8 100644
--- a/src/test/scala/iog/psg/cardano/TxMetadataCodecSpec.scala
+++ b/src/test/scala/iog/psg/cardano/TxMetadataCodecSpec.scala
@@ -82,7 +82,8 @@ class TxMetadataCodecSpec extends AnyFlatSpec with Matchers with DummyModel {
       3 -> MetadataValueArray(Seq(
         MetadataValueLong(14),
         MetadataValueByteString(ByteString("2512a00e9653fe49a44a5886202e24d77eeb998f")),
-        MetadataValueStr("1337")
+        MetadataValueStr("1337"),
+        MetadataValueMap(Map(MetadataValueLong(1) -> MetadataValueLong(3)))
       )),
       4 -> MetadataValueMap(
         Map(
diff --git a/src/test/scala/iog/psg/cardano/util/DummyModel.scala b/src/test/scala/iog/psg/cardano/util/DummyModel.scala
index c9df2d4..8714439 100644
--- a/src/test/scala/iog/psg/cardano/util/DummyModel.scala
+++ b/src/test/scala/iog/psg/cardano/util/DummyModel.scala
@@ -69,6 +69,18 @@ trait DummyModel { self: Assertions =>
                                  |          },
                                  |          {
                                  |            "string": "1337"
+                                 |          },
+                                 |          {
+                                 |            "map": [
+                                 |              {
+                                 |                "k": {
+                                 |                  "int":1
+                                 |                },
+                                 |                "v":{
+                                 |                  "int": 3
+                                 |                }
+                                 |              }
+                                 |            ]
                                  |          }
                                  |        ]
                                  |      },