diff --git a/app/models/formations.py b/app/models/formations.py
index 7f99d4f761..f1947f731f 100644
--- a/app/models/formations.py
+++ b/app/models/formations.py
@@ -67,6 +67,9 @@ class Formation(db.Model):
         """
         e = dict(self.__dict__)
         e.pop("_sa_instance_state", None)
+        e.pop("referentiel_competence_id")
+        if "referentiel_competence" in e:
+            e.pop("referentiel_competence")
         e["departement"] = self.departement.to_dict()
         e["formation_id"] = self.id  # ScoDoc7 backward compat
         if with_refcomp_attrs and self.referentiel_competence:
diff --git a/sco_version.py b/sco_version.py
index 7db68e86ce..48027b235f 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.4.17"
+SCOVERSION = "9.4.18"
 
 SCONAME = "ScoDoc"