diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 31aad2b2c..a48605a2b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -82,7 +82,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.13", "3.14"]
+        python-version: ["3.13"]
     
     steps:
       - name: Checkout code
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 803f8a9f5..60c249bf2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,10 @@
+## [0.5.0-rc.1](https://github.com/sequential-parameter-optimization/spotforecast2-safe/compare/v0.4.15...v0.5.0-rc.1) (2026-02-11)
+
+
+### Features
+
+* warnings ([7feeeb4](https://github.com/sequential-parameter-optimization/spotforecast2-safe/commit/7feeeb4662ecd410afa6c7eee978398a8252f7c6))
+
 ## [0.4.15](https://github.com/sequential-parameter-optimization/spotforecast2-safe/compare/v0.4.14...v0.4.15) (2026-02-11)
 
 
diff --git a/pyproject.toml b/pyproject.toml
index 92f9eb781..f149ab1bc 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "spotforecast2-safe"
-version = "0.4.15"
+version = "0.5.0-rc.1"
 description = "spotforecast2-safe (Core): Safety-critical time series forecasting for production"
 readme = "README.md"
 license = { text = "AGPL-3.0-or-later" }
diff --git a/src/spotforecast2_safe/exceptions.py b/src/spotforecast2_safe/exceptions.py
index 65a8410f5..8c120af72 100644
--- a/src/spotforecast2_safe/exceptions.py
+++ b/src/spotforecast2_safe/exceptions.py
@@ -353,18 +353,22 @@ class MissingValuesWarning(UserWarning):
     matrix generates missing values. Most machine learning models do not accept
     missing values, so the Forecaster's `fit' and `predict' methods may fail.
 
+    Args:
+        message (str): The message to display.
+
     Examples:
         >>> import warnings
+        >>> from spotforecast2_safe.exceptions import MissingValuesWarning
         >>> warnings.warn(
         ...     "Missing values detected in input data.",
         ...     MissingValuesWarning
         ... )  # doctest: +SKIP
     """
 
-    def __init__(self, message):
+    def __init__(self, message: str) -> None:
         self.message = message
 
-    def __str__(self):
+    def __str__(self) -> str:
         extra_message = (
             "You can suppress this warning using: "
             "warnings.simplefilter('ignore', category=MissingValuesWarning)"
diff --git a/tests/test_exceptions_examples.py b/tests/test_exceptions_examples.py
new file mode 100644
index 000000000..a3f60cfc1
--- /dev/null
+++ b/tests/test_exceptions_examples.py
@@ -0,0 +1,16 @@
+# SPDX-FileCopyrightText: 2026 bartzbeielstein
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import pytest
+import warnings
+from spotforecast2_safe.exceptions import MissingValuesWarning
+
+
+def test_missing_values_warning_example():
+    """
+    Test the example from MissingValuesWarning docstring.
+    """
+    with pytest.warns(
+        MissingValuesWarning, match="Missing values detected in input data."
+    ):
+        warnings.warn("Missing values detected in input data.", MissingValuesWarning)