diff --git a/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/HttpSamDAO.scala b/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/HttpSamDAO.scala
index 071fbe1c58..6b8ebb3c02 100644
--- a/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/HttpSamDAO.scala
+++ b/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/HttpSamDAO.scala
@@ -327,6 +327,18 @@ class HttpSamDAO(baseSamServiceURL: String, rawlsCredential: RawlsCredential, ti
       callback.future.map(_ => ())
     }
 
+  override def deleteResourceCascade(resourceTypeName: SamResourceTypeName,
+                                     resourceId: String,
+                                     ctx: RawlsRequestContext
+  ): Future[Unit] =
+    retry(when401or5xx) { () =>
+      val callback = new SamApiCallback[Void]("deleteResourceCascadeV2")
+
+      resourcesApi(ctx).deleteResourceCascadeV2Async(resourceTypeName.value, resourceId, callback)
+
+      callback.future.map(_ => ())
+    }
+
   override def userHasAction(resourceTypeName: SamResourceTypeName,
                              resourceId: String,
                              action: SamResourceAction,
diff --git a/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/SamDAO.scala b/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/SamDAO.scala
index cc95dd32dc..a466739ad9 100644
--- a/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/SamDAO.scala
+++ b/core/src/main/scala/org/broadinstitute/dsde/rawls/dataaccess/SamDAO.scala
@@ -56,6 +56,8 @@ trait SamDAO {
 
   def deleteResource(resourceTypeName: SamResourceTypeName, resourceId: String, ctx: RawlsRequestContext): Future[Unit]
 
+  def deleteResourceCascade(resourceTypeName: SamResourceTypeName, resourceId: String, ctx: RawlsRequestContext): Future[Unit]
+
   def userHasAction(resourceTypeName: SamResourceTypeName,
                     resourceId: String,
                     action: SamResourceAction,
diff --git a/core/src/main/scala/org/broadinstitute/dsde/rawls/workspace/WorkspaceService.scala b/core/src/main/scala/org/broadinstitute/dsde/rawls/workspace/WorkspaceService.scala
index 2442b0b3d3..44e3b7e508 100644
--- a/core/src/main/scala/org/broadinstitute/dsde/rawls/workspace/WorkspaceService.scala
+++ b/core/src/main/scala/org/broadinstitute/dsde/rawls/workspace/WorkspaceService.scala
@@ -495,16 +495,21 @@ class WorkspaceService(
     // Delete Google Project
     _ <- traceFutureWithParent("deleteGoogleProject", ctx)(_ => deleteGoogleProject(workspace.googleProjectId))
     // attempt to delete workspace in WSM, in case thsi is a TDR snapshot - but don't fail on it
-    _ = Try(workspaceManagerDAO.deleteWorkspace(workspace.workspaceIdAsUUID, ctx)).recover {
+    _ = Try {
+      logger.warn(s"Deleting workspace in WSM")
+      workspaceManagerDAO.deleteWorkspace(workspace.workspaceIdAsUUID, ctx)
+    }.recover {
       case e: ApiException if e.getCode != StatusCodes.NotFound.intValue =>
         logger.warn(s"Unexpected failure deleting workspace in WSM for workspace `${workspace.toWorkspaceName}]", e)
     }
     // Delete the workspace records in Rawls. Do this after deleting the google project to prevent service perimeter leaks.
-    _ <- traceFutureWithParent("deleteWorkspaceTransaction", ctx)(_ =>
+    _ <- traceFutureWithParent("deleteWorkspaceTransaction", ctx) { _ =>
+      logger.warn("deleting rawlsworkspace in ws repo")
       workspaceRepository.deleteRawlsWorkspace(workspace)
-    )
+    }
     // Delete workflowCollection resource in sam outside of DB transaction
-    _ <- traceFutureWithParent("deleteWorkflowCollectionSamResource", ctx)(_ =>
+    _ <- traceFutureWithParent("deleteWorkflowCollectionSamResource", ctx) { _ =>
+      logger.warn("deleting workflow collection in sam")
       workspace.workflowCollectionName
         .map(cn => samDAO.deleteResource(SamResourceTypeNames.workflowCollection, cn, ctx))
         .getOrElse(Future.successful(())) recover {
@@ -519,9 +524,10 @@ class WorkspaceService(
           )
           throw t
       }
-    )
-    _ <- traceFutureWithParent("deleteWorkspaceSamResource", ctx)(_ =>
-      samDAO.deleteResource(SamResourceTypeNames.workspace, workspace.workspaceId, ctx) recover {
+    }
+    _ <- traceFutureWithParent("deleteWorkspaceSamResource", ctx) { _ =>
+      logger.warn("deleting sam workspace resource with cascade")
+      samDAO.deleteResourceCascade(SamResourceTypeNames.workspace, workspace.workspaceId, ctx) recover {
         case t: RawlsExceptionWithErrorReport if t.errorReport.statusCode.contains(StatusCodes.NotFound) =>
           logger.warn(
             s"Received 404 from delete workspace resource in Sam (while deleting workspace) for workspace `${workspace.toWorkspaceName}`: [${t.errorReport.message}]"
@@ -534,7 +540,7 @@ class WorkspaceService(
           )
           throw t
       }
-    )
+    }
   } yield {
     aborts.onComplete {
       case Failure(t) =>
diff --git a/project/Dependencies.scala b/project/Dependencies.scala
index 0a4926ae85..4476f1612f 100644
--- a/project/Dependencies.scala
+++ b/project/Dependencies.scala
@@ -134,7 +134,7 @@ object Dependencies {
   val resourceBufferService = clientLibExclusions("bio.terra" % "terra-resource-buffer-client" % "0.198.42-SNAPSHOT")
   val billingProfileManager = clientLibExclusions("bio.terra" % "billing-profile-manager-client" % "0.1.566-SNAPSHOT")
   val terraCommonLib = tclExclusions(clientLibExclusions("bio.terra" % "terra-common-lib" % "0.1.23-SNAPSHOT" classifier "plain"))
-  val sam: ModuleID = clientLibExclusions("org.broadinstitute.dsde.workbench" %% "sam-client" % "v0.0.278")
+  val sam: ModuleID = clientLibExclusions("org.broadinstitute.dsde.workbench" %% "sam-client" % "v0.0.289-3368aae-SNAP")
   val leonardo: ModuleID = "org.broadinstitute.dsde.workbench" % "leonardo-client_2.13" % "1.3.6-2e87300"
 
   // OpenTelemetry