diff --git a/pyproject.toml b/pyproject.toml
index e4b42b5..e38d9a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,8 @@ classifiers = [
 ]
 dependencies = [
   "jsonschema>=4.4.0",
-  "fastjsonschema>=2.16.2"
+  "fastjsonschema>=2.16.2",
+  "typing_extensions==4.12.2"
 ]
 
 [project.urls]
diff --git a/raillabel/filter/filter.py b/raillabel/filter/filter.py
index afa17bf..e3ee76e 100644
--- a/raillabel/filter/filter.py
+++ b/raillabel/filter/filter.py
@@ -3,11 +3,17 @@
 
 import pickle
 import typing as t
+from warnings import warn
+
+from typing_extensions import deprecated
 
 from .. import format
 from . import _filter_classes
 
 
+@deprecated(
+    "filter() will not be included in any future releases. Use `scene.filter()` in those versions instead"
+)
 def filter(scene: format.Scene, **kwargs) -> format.Scene:
     """Return a copy of the scene with the annotations filtered.
 
@@ -83,6 +89,9 @@ def filter(scene: format.Scene, **kwargs) -> format.Scene:
     TypeError
         if an unexpected keyword argument has been set.
     """
+    warn(
+        "filter() will not be included in any future releases. Use `scene.filter()` in those versions instead"
+    )
 
     filters_by_level = _collect_filter_classes(kwargs)
     filtered_scene, used_sensors, used_objects = _filter_scene(_copy(scene), filters_by_level)
diff --git a/raillabel/load_/loader_classes/loader_understand_ai.py b/raillabel/load_/loader_classes/loader_understand_ai.py
index d196360..b15d902 100644
--- a/raillabel/load_/loader_classes/loader_understand_ai.py
+++ b/raillabel/load_/loader_classes/loader_understand_ai.py
@@ -3,6 +3,9 @@
 
 import typing as t
 from pathlib import Path
+from warnings import warn
+
+from typing_extensions import deprecated
 
 from ..._util._warning import _WarningsLogger
 from ...format import understand_ai as uai_format
@@ -10,6 +13,7 @@
 from .loader_raillabel import LoaderRailLabel
 
 
+@deprecated("This class will be moved to `raillabel_providerkit` in all future releases.")
 class LoaderUnderstandAi(LoaderABC):
     """Loader class for the Understand.Ai Trains4 annotation format.
 
@@ -49,6 +53,8 @@ def load(self, data: dict, validate: bool = False) -> uai_format.Scene:
             The loaded scene with the data.
         """
 
+        warn("This class will be moved to `raillabel_providerkit` in all future releases.")
+
         if validate:
             self.validate(data)
 
diff --git a/raillabel/stats/generate_timespan.py b/raillabel/stats/generate_timespan.py
index 44853d7..5847c31 100644
--- a/raillabel/stats/generate_timespan.py
+++ b/raillabel/stats/generate_timespan.py
@@ -3,10 +3,14 @@
 
 import typing as t
 from decimal import Decimal
+from warnings import warn
+
+from typing_extensions import deprecated
 
 from ..format import Scene
 
 
+@deprecated("This function will be removed in all future releases")
 def generate_timespan(scene: Scene) -> t.Tuple[t.Optional[Decimal], t.Optional[Decimal]]:
     """Return start and end timestamp of the scene.
 
@@ -22,6 +26,7 @@ def generate_timespan(scene: Scene) -> t.Tuple[t.Optional[Decimal], t.Optional[D
     decimal.Decimal or None
         End timestamp of the scene. Is None if the scene has no frames.
     """
+    warn("This function will be removed in all future releases")
     start_timestamp = None
     end_timestamp = None
 
diff --git a/raillabel/validate/validate.py b/raillabel/validate/validate.py
index 0beab3e..55c01cf 100644
--- a/raillabel/validate/validate.py
+++ b/raillabel/validate/validate.py
@@ -5,13 +5,16 @@
 import os
 import typing as t
 from pathlib import Path
+from warnings import warn
 
 import fastjsonschema
 import jsonschema
+from typing_extensions import deprecated
 
 from .. import exceptions
 
 
+@deprecated("This function will be moved to `raillabel_providerkit` in all future releases.")
 def validate(data: dict, schema_path: str = "raillabel") -> t.Tuple[bool, t.List[str]]:
     """Validate JSON data represented by a dict via a given schema.
 
@@ -38,6 +41,8 @@ def validate(data: dict, schema_path: str = "raillabel") -> t.Tuple[bool, t.List
     # options must be distinguished. It is therefore assumed, that a complete path contains at #
     # least one '/' or '\'.
 
+    warn("This function will be moved to `raillabel_providerkit` in all future releases.")
+
     if "/" in schema_path or "\\" in schema_path:  # if schema_path is a complete path
         schema_path = Path(schema_path)