diff --git a/thehive/app/org/thp/thehive/controllers/v0/ObservableCtrl.scala b/thehive/app/org/thp/thehive/controllers/v0/ObservableCtrl.scala
index 5283de1908..836b4aee55 100644
--- a/thehive/app/org/thp/thehive/controllers/v0/ObservableCtrl.scala
+++ b/thehive/app/org/thp/thehive/controllers/v0/ObservableCtrl.scala
@@ -417,7 +417,7 @@ class PublicObservable(
     )
     .property("message", UMapping.string)(_.field.updatable)
     .property("tlp", UMapping.int)(_.field.updatable)
-    .property("dataType", UMapping.string)(_.field.readonly)
+    .property("dataType", UMapping.string)(_.field.updatable)
     .property("data", UMapping.string.optional)(_.field.readonly)
     .property("attachment.name", UMapping.string.optional)(_.select(_.attachments.value(_.name)).readonly)
     .property("attachment.hashes", UMapping.hash.sequence)(_.select(_.attachments.value(_.hashes)).readonly)
diff --git a/thehive/app/org/thp/thehive/controllers/v1/Properties.scala b/thehive/app/org/thp/thehive/controllers/v1/Properties.scala
index b5a94d8fea..05b5efcc0d 100644
--- a/thehive/app/org/thp/thehive/controllers/v1/Properties.scala
+++ b/thehive/app/org/thp/thehive/controllers/v1/Properties.scala
@@ -442,7 +442,7 @@ class Properties(
       )
       .property("message", UMapping.string)(_.field.updatable)
       .property("tlp", UMapping.int)(_.field.updatable)
-      .property("dataType", UMapping.string)(_.field.readonly)
+      .property("dataType", UMapping.string)(_.field.updatable)
       .property("data", UMapping.string.optional)(_.field.readonly)
       .property("attachment.name", UMapping.string.optional)(_.select(_.attachments.value(_.name)).readonly)
       .property("attachment.hashes", UMapping.hash.sequence)(_.select(_.attachments.value(_.hashes)).readonly)
diff --git a/thehive/app/org/thp/thehive/services/ObservableSrv.scala b/thehive/app/org/thp/thehive/services/ObservableSrv.scala
index ef8299344f..7985d280e6 100644
--- a/thehive/app/org/thp/thehive/services/ObservableSrv.scala
+++ b/thehive/app/org/thp/thehive/services/ObservableSrv.scala
@@ -3,7 +3,7 @@ package org.thp.thehive.services
 import org.apache.tinkerpop.gremlin.process.traversal.P
 import org.apache.tinkerpop.gremlin.structure.Vertex
 import org.thp.scalligraph.auth.{AuthContext, Permission}
-import org.thp.scalligraph.controllers.FFile
+import org.thp.scalligraph.controllers.{FFile, FPath}
 import org.thp.scalligraph.models.{Database, Entity, UMapping}
 import org.thp.scalligraph.query.PropertyUpdater
 import org.thp.scalligraph.services._
@@ -173,14 +173,30 @@ class ObservableSrv(
   override def update(
       traversal: Traversal.V[Observable],
       propertyUpdaters: Seq[PropertyUpdater]
-  )(implicit graph: Graph, authContext: AuthContext): Try[(Traversal.V[Observable], JsObject)] =
-    auditSrv.mergeAudits(super.update(traversal, propertyUpdaters)) {
-      case (observableSteps, updatedFields) =>
-        observableSteps
-          .clone()
-          .getOrFail("Observable")
-          .flatMap(observable => auditSrv.observable.update(observable, updatedFields))
+  )(implicit graph: Graph, authContext: AuthContext): Try[(Traversal.V[Observable], JsObject)] = {
+
+    val canUpdateDataType = propertyUpdaters.find(_.path == FPath("dataType")) match {
+      case Some(newDataTypeProp) =>
+        for {
+          obs             <- traversal.clone().getOrFail("Observable")
+          currentDatatype <- observableTypeSrv.getByName(obs.dataType).getOrFail("ObservableType")
+          newDataType     <- observableTypeSrv.getByName(newDataTypeProp.value.toString).getOrFail("ObservableType")
+          isSameType = currentDatatype.isAttachment == newDataType.isAttachment
+          _ <- if (isSameType) Success(()) else Failure(BadRequestError("Can not update dataType: isAttachment does not match"))
+        } yield ()
+      case None => Success(())
     }
+
+    canUpdateDataType.flatMap { _ =>
+      auditSrv.mergeAudits(super.update(traversal, propertyUpdaters)) {
+        case (observableSteps, updatedFields) =>
+          observableSteps
+            .clone()
+            .getOrFail("Observable")
+            .flatMap(observable => auditSrv.observable.update(observable, updatedFields))
+      }
+    }
+  }
 }
 
 trait ObservableOpsNoDeps { _: TheHiveOpsNoDeps =>