diff --git a/src/neptune_scale/__init__.py b/src/neptune_scale/__init__.py
index 2bc91f16..15e64e09 100644
--- a/src/neptune_scale/__init__.py
+++ b/src/neptune_scale/__init__.py
@@ -442,7 +442,7 @@ def log_metrics(
         """
         self.log(step=step, timestamp=timestamp, metrics=data)
 
-    def log_configs(self, data: Optional[Dict[str, Union[float, bool, int, str, datetime, list, set]]] = None) -> None:
+    def log_configs(self, data: Optional[Dict[str, Union[float, bool, int, str, datetime]]] = None) -> None:
         """
         Logs the specified metadata to a Neptune run.
 
@@ -516,7 +516,7 @@ def log(
         self,
         step: Optional[Union[float, int]] = None,
         timestamp: Optional[datetime] = None,
-        configs: Optional[Dict[str, Union[float, bool, int, str, datetime, list, set]]] = None,
+        configs: Optional[Dict[str, Union[float, bool, int, str, datetime]]] = None,
         metrics: Optional[Dict[str, Union[float, int]]] = None,
         tags_add: Optional[Dict[str, Union[List[str], Set[str]]]] = None,
         tags_remove: Optional[Dict[str, Union[List[str], Set[str]]]] = None,
@@ -548,7 +548,7 @@ def log(
         verify_collection_type("`tags_add` keys", list(tags_add.keys()), str)
         verify_collection_type("`tags_remove` keys", list(tags_remove.keys()), str)
 
-        verify_collection_type("`configs` values", list(configs.values()), (float, bool, int, str, datetime, list, set))
+        verify_collection_type("`configs` values", list(configs.values()), (float, bool, int, str, datetime))
         verify_collection_type("`metrics` values", list(metrics.values()), (float, int))
         verify_collection_type("`tags_add` values", list(tags_add.values()), (list, set))
         verify_collection_type("`tags_remove` values", list(tags_remove.values()), (list, set))
diff --git a/src/neptune_scale/core/metadata_splitter.py b/src/neptune_scale/core/metadata_splitter.py
index 2aec1ea7..c2018926 100644
--- a/src/neptune_scale/core/metadata_splitter.py
+++ b/src/neptune_scale/core/metadata_splitter.py
@@ -43,7 +43,7 @@ def __init__(
         run_id: str,
         step: Optional[Union[int, float]],
         timestamp: datetime,
-        fields: Dict[str, Union[float, bool, int, str, datetime, list, set]],
+        fields: Dict[str, Union[float, bool, int, str, datetime]],
         metrics: Dict[str, float],
         add_tags: Dict[str, Union[List[str], Set[str]]],
         remove_tags: Dict[str, Union[List[str], Set[str]]],