diff --git a/backend/src/zimfarm_backend/common/schemas/orms.py b/backend/src/zimfarm_backend/common/schemas/orms.py
index 4e7e902e2..d5a223e31 100644
--- a/backend/src/zimfarm_backend/common/schemas/orms.py
+++ b/backend/src/zimfarm_backend/common/schemas/orms.py
@@ -290,6 +290,7 @@ class ScheduleHistorySchema(BaseModel):
     periodicity: str
     context: str
     archived: bool
+    offliner_definition_version: str | None = None
     # entries are serialized as dict[str, Any] instead of ScheduleConfigSchema
     # because the entry is possibly outdated and would fail validation as the
     # offliner schema evolves
diff --git a/backend/src/zimfarm_backend/db/models.py b/backend/src/zimfarm_backend/db/models.py
index a98740467..b0edb3b2d 100644
--- a/backend/src/zimfarm_backend/db/models.py
+++ b/backend/src/zimfarm_backend/db/models.py
@@ -310,6 +310,7 @@ class ScheduleHistory(Base):
     language_code: Mapped[str]
     tags: Mapped[list[str]]
     periodicity: Mapped[str]
+    offliner_definition_version: Mapped[str | None]
     context: Mapped[str] = mapped_column(default="", server_default="")
     archived: Mapped[bool] = mapped_column(default=False, server_default=false())
 
diff --git a/backend/src/zimfarm_backend/db/schedule.py b/backend/src/zimfarm_backend/db/schedule.py
index ba8f29eb6..6a500183f 100644
--- a/backend/src/zimfarm_backend/db/schedule.py
+++ b/backend/src/zimfarm_backend/db/schedule.py
@@ -399,6 +399,7 @@ def create_schedule(
         tags=schedule.tags,
         periodicity=schedule.periodicity,
         context=schedule.context,
+        offliner_definition_version=offliner_definition.version,
     )
     schedule.history_entries.append(history_entry)
 
@@ -531,6 +532,7 @@ def toggle_archive_status(
         periodicity=schedule.periodicity,
         context=schedule.context,
         archived=schedule.archived,
+        offliner_definition_version=schedule.offliner_definition.version,
     )
     schedule.history_entries.append(history_entry)
     session.add(schedule)
@@ -599,6 +601,7 @@ def update_schedule(
         periodicity=schedule.periodicity,
         context=schedule.context,
         archived=schedule.archived,
+        offliner_definition_version=offliner_definition.version,
     )
     schedule.history_entries.append(history_entry)
 
@@ -642,6 +645,7 @@ def create_schedule_history_schema(
         context=history_entry.context,
         config=history_entry.config,
         archived=history_entry.archived,
+        offliner_definition_version=history_entry.offliner_definition_version,
     )
 
 
diff --git a/backend/src/zimfarm_backend/migrations/versions/8b0210f9d9ab_store_offliner_definition_version_in_.py b/backend/src/zimfarm_backend/migrations/versions/8b0210f9d9ab_store_offliner_definition_version_in_.py
new file mode 100644
index 000000000..6e5238f19
--- /dev/null
+++ b/backend/src/zimfarm_backend/migrations/versions/8b0210f9d9ab_store_offliner_definition_version_in_.py
@@ -0,0 +1,59 @@
+"""store offliner definition version in schedule history
+
+Revision ID: 8b0210f9d9ab
+Revises: b298a5831211
+Create Date: 2025-11-25 09:57:58.062755
+
+"""
+
+import sqlalchemy as sa
+from alembic import op
+from sqlalchemy.orm import Session
+
+# revision identifiers, used by Alembic.
+revision = "8b0210f9d9ab"
+down_revision = "b298a5831211"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column(
+        "schedule_history",
+        sa.Column("offliner_definition_version", sa.String(), nullable=True),
+    )
+    # ### end Alembic commands ###
+
+    # Populate offliner_definition_version for latest schedule_history of each schedule
+    bind = op.get_bind()
+    session = Session(bind=bind)
+    session.execute(
+        sa.text(
+            """
+            WITH latest AS (
+                SELECT DISTINCT ON (schedule_id)
+                    id AS history_id,
+                    schedule_id
+                FROM schedule_history
+                ORDER BY schedule_id, created_at DESC
+            )
+
+            UPDATE schedule_history AS sh
+            SET offliner_definition_version = od.version
+            FROM schedule AS s
+            JOIN offliner_definition AS od
+                ON s.offliner_definition_id = od.id
+            JOIN latest
+                ON latest.schedule_id = s.id
+            WHERE sh.schedule_id = s.id
+            AND sh.id = latest.history_id
+            """
+        )
+    )
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column("schedule_history", "offliner_definition_version")
+    # ### end Alembic commands ###
diff --git a/backend/tests/conftest.py b/backend/tests/conftest.py
index 9ef7d405f..cf30377f1 100644
--- a/backend/tests/conftest.py
+++ b/backend/tests/conftest.py
@@ -944,6 +944,7 @@ def _create_schedule(
             tags=schedule.tags,
             periodicity=schedule.periodicity,
             context=schedule.context,
+            offliner_definition_version=mwoffliner_definition.version,
         )
         schedule.history_entries.append(history_entry)
 
diff --git a/frontend-ui/src/types/schedule.ts b/frontend-ui/src/types/schedule.ts
index 9fa1df5e8..15debcce5 100644
--- a/frontend-ui/src/types/schedule.ts
+++ b/frontend-ui/src/types/schedule.ts
@@ -33,6 +33,7 @@ export interface BaseScheduleHistorySchema {
   periodicity: string
   context: string
   archived: boolean
+  offliner_definition_version?: string
 }
 
 export interface ScheduleHistorySchema extends BaseScheduleHistorySchema {