diff --git a/setup.py b/setup.py
index 147d7b6..22afe7c 100755
--- a/setup.py
+++ b/setup.py
@@ -18,6 +18,9 @@
     packages=find_packages(),
     include_package_data=True,
     install_requires=["pyyaml"],
+    extras_requires={
+        'ruamel': ['ruamel.yaml']
+    },
     python_requires=">=3.8",
     entry_points={
         "console_scripts": ["yamale=yamale.command_line:main"],
@@ -34,5 +37,6 @@
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
+        "Programming Language :: Python :: 3.13",
     ],
 )
diff --git a/tox.ini b/tox.ini
index fff02c0..27a416f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,10 +1,10 @@
 [tox]
-envlist = py38, py310
+envlist = py38, py313
 
 [gh-actions]
 python =
     3.8: py38
-    3.12: py312
+    3.13: py313
 
 [testenv]
 commands = py.test --cov yamale --cov-report term-missing yamale
diff --git a/yamale/command_line.py b/yamale/command_line.py
index d5cb929..251841d 100644
--- a/yamale/command_line.py
+++ b/yamale/command_line.py
@@ -110,7 +110,7 @@ def _router(paths, schema_name, cpus, parser, strict=True):
 def main():
     parser = argparse.ArgumentParser(description="Validate yaml files.")
     parser.add_argument(
-        "paths", metavar="PATHS", default=["./"], nargs="*", help="Paths to validate, either directories or files. Default is the current directory."
+        "paths", metavar="PATH", default=["./"], nargs="*", help="Paths to validate, either directories or files. Default is the current directory."
     )
     parser.add_argument("-V", "--version", action="version", version=__version__)
     parser.add_argument("-s", "--schema", default="schema.yaml", help="filename of schema. Default is schema.yaml.")