diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 40bc09f..32ea408 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -33,11 +33,11 @@ repos:
         language: python
         name: Check licenses of Python dependencies
   - repo: https://github.com/editorconfig-checker/editorconfig-checker.python
-    rev: 3.6.0
+    rev: 3.6.1
     hooks:
       - id: editorconfig-checker
   - repo: https://github.com/python-jsonschema/check-jsonschema
-    rev: 0.35.0
+    rev: 0.37.0
     hooks:
       - id: check-github-workflows
       - id: check-github-actions
@@ -54,7 +54,7 @@ repos:
           - flake8-docstrings-complete
           - flake8-pyproject
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.14.8
+    rev: v0.15.6
     hooks:
       - id: ruff-check
         name: Linting Python code (ruff)
@@ -62,7 +62,7 @@ repos:
       - id: ruff-format
         name: Formatting Python code (ruff)
   - repo: https://github.com/codespell-project/codespell
-    rev: v2.4.1
+    rev: v2.4.2
     hooks:
       - id: codespell
         name: Fixing common spelling mistakes
@@ -75,20 +75,20 @@ repos:
       - id: docformatter
         name: Fixing docstring formatting
   - repo: https://github.com/igorshubovych/markdownlint-cli
-    rev: v0.46.0
+    rev: v0.48.0
     hooks:
       - id: markdownlint
         name: Fixing markdown linting errors
         args: [--disable, MD013, MD033, --fix]
   - repo: https://github.com/macisamuele/language-formatters-pre-commit-hooks
-    rev: v2.15.0
+    rev: v2.16.0
     hooks:
       - id: pretty-format-yaml
         args: [--autofix, --indent, "2", --offset, "2", --preserve-quotes]
       - id: pretty-format-toml
         args: [--autofix]
   - repo: https://github.com/pre-commit/mirrors-mypy
-    rev: v1.19.0
+    rev: v1.19.1
     hooks:
       - id: mypy
         name: Static typechecking (mypy)
diff --git a/src/pycasx/scenario/__init__.py b/src/pycasx/scenario/__init__.py
index 1900c0a..3c433df 100644
--- a/src/pycasx/scenario/__init__.py
+++ b/src/pycasx/scenario/__init__.py
@@ -90,18 +90,18 @@ class GeographicCoordinates:
 
 
 @overload
-def convert(value: int | float) -> float: ...
+def convert(value: float) -> float: ...
 
 
 @overload
-def convert(value: int | float, unit: str) -> float: ...
+def convert(value: float, unit: str) -> float: ...
 
 
 @overload
 def convert(value: str, unit: str) -> float: ...
 
 
-def convert(value: int | float | str, unit: str = "") -> float:
+def convert(value: float | str, unit: str = "") -> float:
     """Convert a value to a specific unit.
 
     This function takes a value and a unit and converts the value to the