diff --git a/colour_datasets/loaders/labsphere2019.py b/colour_datasets/loaders/labsphere2019.py
index 2f57d3c..c31eac9 100644
--- a/colour_datasets/loaders/labsphere2019.py
+++ b/colour_datasets/loaders/labsphere2019.py
@@ -14,11 +14,13 @@
     doi:10.5281/zenodo.3245875
 """
 
+from __future__ import annotations
+
 import os
 
 import numpy as np
 from colour import SpectralDistribution
-from colour.hints import Dict, Optional
+from colour.hints import Dict
 from colour.utilities import tsplit
 
 from colour_datasets.loaders import AbstractDatasetLoader
@@ -95,7 +97,7 @@ def load(self) -> Dict[str, SpectralDistribution]:
         return self._content
 
 
-_DATASET_LOADER_LABSPHERE2019: Optional[DatasetLoader_Labsphere2019] = None
+_DATASET_LOADER_LABSPHERE2019: DatasetLoader_Labsphere2019 | None = None
 """
 Singleton instance of the *Labsphere (2019)* *Labsphere SRS-99-020* dataset
 loader.
diff --git a/pyproject.toml b/pyproject.toml
index facfa47..f4940d4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -129,7 +129,7 @@ reportUnusedExpression = false
 addopts = "--durations=5"
 
 [tool.ruff]
-target-version = "py39"
+target-version = "py310"
 line-length = 88
 select = [
     "A", # flake8-builtins
@@ -206,6 +206,7 @@ ignore = [
     "RET508",
     "TRY003",
     "TRY300",
+    "UP038",
 ]
 typing-modules = ["colour.hints"]
 fixable = ["B", "C", "E", "F", "PIE", "RUF", "SIM", "UP", "W"]