diff --git a/src/agent_toolkit/forestadmin/agent_toolkit/resources/collections/stats.py b/src/agent_toolkit/forestadmin/agent_toolkit/resources/collections/stats.py
index 816d6c4c2..e4c1b9ee2 100644
--- a/src/agent_toolkit/forestadmin/agent_toolkit/resources/collections/stats.py
+++ b/src/agent_toolkit/forestadmin/agent_toolkit/resources/collections/stats.py
@@ -28,7 +28,7 @@
 class StatsResource(BaseCollectionResource, ContextVariableInjectorResourceMixin):
     FREQUENCIES = {"Day": "d", "Week": "W-MON", "Month": "BMS", "Year": "BYS"}
 
-    FORMAT = {"Day": "%d/%m/%Y", "Week": "W%V-%Y", "Month": "%b %Y", "Year": "%Y"}
+    FORMAT = {"Day": "%d/%m/%Y", "Week": "W%V-%G", "Month": "%b %Y", "Year": "%Y"}
 
     def stats_method(self, type: str):
         return {
diff --git a/src/agent_toolkit/tests/resources/collections/test_stats_resources.py b/src/agent_toolkit/tests/resources/collections/test_stats_resources.py
index cf36cdaed..d2e131bdb 100644
--- a/src/agent_toolkit/tests/resources/collections/test_stats_resources.py
+++ b/src/agent_toolkit/tests/resources/collections/test_stats_resources.py
@@ -636,6 +636,33 @@ def test_line_should_return_chart_with_week_filter(self):
             {"label": "W02-2022", "values": {"value": 15}},
         )
 
+    def test_line_week_label_should_be_with_iso_year(self):
+        request = self.mk_request("Week")
+        with patch.object(
+            self.book_collection,
+            "aggregate",
+            new_callable=AsyncMock,
+            return_value=[
+                {"value": 10, "group": {"date": "2024-12-23 00:00:00"}},
+                {"value": 15, "group": {"date": "2024-12-30 00:00:00"}},
+                {"value": 20, "group": {"date": "2025-01-06 00:00:00"}},
+            ],
+        ):
+            response = self.loop.run_until_complete(self.stat_resource.line(request))
+
+        content_body = json.loads(response.body)
+        self.assertEqual(response.status, 200)
+        self.assertEqual(content_body["data"]["type"], "stats")
+        self.assertEqual(len(content_body["data"]["attributes"]["value"]), 3)
+        self.assertEqual(
+            content_body["data"]["attributes"]["value"],
+            [
+                {"label": "W52-2024", "values": {"value": 10}},
+                {"label": "W01-2025", "values": {"value": 15}},
+                {"label": "W02-2025", "values": {"value": 20}},
+            ],
+        )
+
     def test_line_should_return_chart_with_month_filter(self):
         request = self.mk_request("Month")
         with patch.object(
diff --git a/src/datasource_toolkit/forestadmin/datasource_toolkit/decorators/chart/result_builder.py b/src/datasource_toolkit/forestadmin/datasource_toolkit/decorators/chart/result_builder.py
index 0dfa1b6e9..1d3545e28 100644
--- a/src/datasource_toolkit/forestadmin/datasource_toolkit/decorators/chart/result_builder.py
+++ b/src/datasource_toolkit/forestadmin/datasource_toolkit/decorators/chart/result_builder.py
@@ -55,7 +55,7 @@ class ResultBuilder:
 
     FORMATS: Dict[DateOperation, str] = {
         DateOperation.DAY: "%d/%m/%Y",
-        DateOperation.WEEK: "W%V-%Y",
+        DateOperation.WEEK: "W%V-%G",
         DateOperation.MONTH: "%b %Y",
         DateOperation.YEAR: "%Y",
     }
diff --git a/src/datasource_toolkit/tests/decorators/chart/test_chart_result_builder.py b/src/datasource_toolkit/tests/decorators/chart/test_chart_result_builder.py
index 93b478fd7..43c225121 100644
--- a/src/datasource_toolkit/tests/decorators/chart/test_chart_result_builder.py
+++ b/src/datasource_toolkit/tests/decorators/chart/test_chart_result_builder.py
@@ -109,6 +109,24 @@ def test_time_based_should_return_correct_format_week(self):
             {"label": "W02-1986", "values": {"value": 7}},
         ]
 
+    def test_time_based_should_return_correct_format_week_iso_year(self):
+        result = ResultBuilder.time_based(
+            DateOperation.WEEK,
+            {
+                "2024-12-23": 1,
+                "2024-12-30": 0,
+                "2025-01-06": 7,
+            },
+        )
+        self.assertEqual(
+            result,
+            [
+                {"label": "W52-2024", "values": {"value": 1}},
+                {"label": "W01-2025", "values": {"value": 0}},
+                {"label": "W02-2025", "values": {"value": 7}},
+            ],
+        )
+
     def test_time_based_should_return_correct_format_month(self):
         result = ResultBuilder.time_based(
             DateOperation.MONTH,