diff --git a/apptax/migrations/versions/2c68a907f74c_increase_t_medias_source_size.py b/apptax/migrations/versions/2c68a907f74c_increase_t_medias_source_size.py
new file mode 100644
index 00000000..be0e6f95
--- /dev/null
+++ b/apptax/migrations/versions/2c68a907f74c_increase_t_medias_source_size.py
@@ -0,0 +1,33 @@
+"""increase t_medias.source size
+
+Revision ID: 2c68a907f74c
+Revises: 3c4762751898
+Create Date: 2024-12-19 10:31:05.778720
+
+"""
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "2c68a907f74c"
+down_revision = "3c4762751898"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.alter_column(
+        "t_medias", "source", type_=sa.Unicode(), existing_nullable=True, schema="taxonomie"
+    )
+
+
+def downgrade():
+    op.alter_column(
+        "t_medias",
+        "source",
+        type_=sa.VARCHAR(length=25),
+        existing_nullable=True,
+        schema="taxonomie",
+    )
diff --git a/apptax/taxonomie/models.py b/apptax/taxonomie/models.py
index d0b244d5..aaffafe4 100644
--- a/apptax/taxonomie/models.py
+++ b/apptax/taxonomie/models.py
@@ -174,7 +174,11 @@ class Taxref(db.Model):
 
     status = db.relationship("VBdcStatus", order_by="VBdcStatus.lb_type_statut")
     synonymes = db.relationship(
-        "Taxref", foreign_keys=[cd_ref], primaryjoin="Taxref.cd_ref == Taxref.cd_ref", uselist=True
+        "Taxref",
+        foreign_keys=[cd_ref],
+        primaryjoin="Taxref.cd_ref == Taxref.cd_ref",
+        uselist=True,
+        post_update=True,
     )
     parent = db.relationship("Taxref", primaryjoin=foreign(cd_sup) == remote(cd_ref))
     attributs = db.relationship("CorTaxonAttribut", back_populates="taxon")
diff --git a/apptax/tests/fixtures.py b/apptax/tests/fixtures.py
index aec6503f..f7fd46af 100644
--- a/apptax/tests/fixtures.py
+++ b/apptax/tests/fixtures.py
@@ -34,7 +34,6 @@ def noms_without_listexample():
     with db.session.begin_nested():
         for cd_nom, cd_ref, nom_francais, comments, attr in bibnom_exemple:
             nom = Taxref.query.get(cd_nom)
-            db.session.add(nom)
             noms.append(nom)
     return noms
 
diff --git a/docs/changelog.md b/docs/changelog.md
index 74af0243..9b4e4833 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1,5 +1,14 @@
 # CHANGELOG
 
+
+2.1.1 (unreleased)
+------------------
+
+**🚀 Nouveautés**
+
+- La limite du nombre de caractères dans la colonne `source` des médias est levée (#595 par @jacquesfize,@amandine-sahl) 
+
+
 2.1.0 (2024-12-06)
 ------------------