diff --git a/.github/workflows/run-tests.yml b/.github/workflows/run-tests.yml
index b6b45f8..ad56432 100644
--- a/.github/workflows/run-tests.yml
+++ b/.github/workflows/run-tests.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.8", "3.13"]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/setup.py b/setup.py
index 147d7b6..06f4a15 100755
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
     version=version,
     url="https://github.com/23andMe/Yamale",
     author="Bo Lopker",
-    author_email="blopker@23andme.com",
+    author_email="dev-api@23andme.com",
     description="A schema and validator for YAML.",
     long_description=readme,
     long_description_content_type="text/markdown",
@@ -18,6 +18,7 @@
     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 +35,6 @@
         "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/VERSION b/yamale/VERSION
index 26d99a2..03f488b 100644
--- a/yamale/VERSION
+++ b/yamale/VERSION
@@ -1 +1 @@
-5.2.1
+5.3.0
diff --git a/yamale/command_line.py b/yamale/command_line.py
index d5cb929..3c35751 100644
--- a/yamale/command_line.py
+++ b/yamale/command_line.py
@@ -110,7 +110,11 @@ 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.")
diff --git a/yamale/tests/test_command_line.py b/yamale/tests/test_command_line.py
index e5c4cf9..1d01c49 100644
--- a/yamale/tests/test_command_line.py
+++ b/yamale/tests/test_command_line.py
@@ -51,18 +51,28 @@ def test_good_yaml(parser):
 
 
 def test_multiple_paths_good_yaml():
-    command_line._router([
-        "yamale/tests/command_line_fixtures/yamls/good.yaml",
-        "yamale/tests/command_line_fixtures/yamls/good2.yaml",
-    ], "schema.yaml", 1, "PyYAML")
+    command_line._router(
+        [
+            "yamale/tests/command_line_fixtures/yamls/good.yaml",
+            "yamale/tests/command_line_fixtures/yamls/good2.yaml",
+        ],
+        "schema.yaml",
+        1,
+        "PyYAML",
+    )
 
 
 def test_multiple_paths_bad_yaml():
     with pytest.raises(ValueError) as e:
-        command_line._router([
-            "yamale/tests/command_line_fixtures/yamls/good.yaml",
-            "yamale/tests/command_line_fixtures/yamls/bad.yaml",
-        ], "schema.yaml", 1, "PyYAML")
+        command_line._router(
+            [
+                "yamale/tests/command_line_fixtures/yamls/good.yaml",
+                "yamale/tests/command_line_fixtures/yamls/bad.yaml",
+            ],
+            "schema.yaml",
+            1,
+            "PyYAML",
+        )
     assert "map.bad: '12.5' is not a int." in e.value.message
 
 
diff --git a/yamale/validators/validators.py b/yamale/validators/validators.py
index 20fbb7a..16886de 100644
--- a/yamale/validators/validators.py
+++ b/yamale/validators/validators.py
@@ -257,7 +257,9 @@ def __init__(self, *args, **kwargs):
         super(SemVer, self).__init__(*args, **kwargs)
         self.regexes = [
             # https://semver.org/#is-there-a-suggested-regular-expression-regex-to-check-a-semver-string
-            re.compile(r"^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"),
+            re.compile(
+                r"^(?P<major>0|[1-9]\d*)\.(?P<minor>0|[1-9]\d*)\.(?P<patch>0|[1-9]\d*)(?:-(?P<prerelease>(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+(?P<buildmetadata>[0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?$"
+            ),
         ]