diff --git a/pyhgf/utils/get_update_sequence.py b/pyhgf/utils/get_update_sequence.py
index 1ad304ccc..b385b245a 100644
--- a/pyhgf/utils/get_update_sequence.py
+++ b/pyhgf/utils/get_update_sequence.py
@@ -9,6 +9,7 @@
 from pyhgf.updates.posterior.continuous import (
     continuous_node_posterior_update,
     continuous_node_posterior_update_ehgf,
+    continuous_node_posterior_update_unbounded,
 )
 from pyhgf.updates.prediction.binary import binary_state_node_prediction
 from pyhgf.updates.prediction.continuous import continuous_node_prediction
@@ -135,7 +136,12 @@ def get_update_sequence(
             if all([i not in nodes_without_prediction_error for i in all_children]):
                 no_update = False
                 if network.edges[idx].node_type == 2:
-                    if update_type == "eHGF":
+                    if update_type == "unbounded":
+                        if network.edges[idx].volatility_children is not None:
+                            update_fn = continuous_node_posterior_update_unbounded
+                        else:
+                            update_fn = continuous_node_posterior_update
+                    elif update_type == "eHGF":
                         if network.edges[idx].volatility_children is not None:
                             update_fn = continuous_node_posterior_update_ehgf
                         else: