diff --git a/.github/workflows/unittests.yaml b/.github/workflows/unittests.yaml
new file mode 100644
index 0000000..ce90d74
--- /dev/null
+++ b/.github/workflows/unittests.yaml
@@ -0,0 +1,74 @@
+name: Pytest
+
+on:
+  push:
+    branches:
+      - master
+  pull_request: {}
+
+jobs:
+  test:
+    name: Unit Tests
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      matrix:
+        os: [ubuntu-22.04, windows-latest, macos-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+        cache: pip
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest pytest-cov
+        pip install -r requirements.txt
+    
+    - name: Test
+      run: |
+        pytest
+
+  coverage:
+    name: Coverage Summary
+    runs-on: ubuntu-22.04
+    permissions:
+      pull-requests: write
+      contents: read
+
+    if: github.event_name == 'pull_request'
+    strategy:
+      fail-fast: false
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.11"
+        cache: pip
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install pytest pytest-cov
+        pip install -r requirements.txt
+
+    - name: Run Coverage
+      run: |
+        pytest --junitxml=pytest.xml --cov-report=term-missing:skip-covered --cov=semver | tee pytest-coverage.txt
+
+    - name: Comment Result Summary
+      uses: MishaKav/pytest-coverage-comment@main
+      with:
+        pytest-coverage-path: ./pytest-coverage.txt
+        junitxml-path: ./pytest.xml
diff --git a/Dockerfile b/Dockerfile
index af9c6be..190f287 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,29 +1,33 @@
-FROM centos/python-36-centos7
- 
-USER root
+# ======= #
+# Builder #
+# ======= #
+FROM python:3.11-slim as builder
+COPY / /semver
+RUN pip wheel --no-cache-dir --wheel-dir /wheels /semver
 
-#Perform updates
-RUN pip install --upgrade pip
-RUN yum update -y
-RUN yum -y remove git
-RUN yum -y install https://packages.endpoint.com/rhel/7/os/x86_64/endpoint-repo-1.7-1.x86_64.rpm
-RUN yum -y install git
+# ======== #
+# Finalize #
+# ======== #
+FROM python:3.11-slim
 
-#Setup semver
-ADD / /semver
-WORKDIR /semver
-RUN python setup.py sdist
-RUN pip install dist/semver-*.tar.gz
+# Update and install git
+RUN apt-get update && apt-get install -y git
+
+# Create user
+RUN mkdir /semver && \
+    groupadd -g 10001 semver && \
+    useradd -u 10000 -g semver -d /semver semver \
+    && chown -R semver:semver /semver
 
 # Prep workspace
-RUN mkdir /workspace
-WORKDIR /workspace
+RUN mkdir /workspace && \
+    chown -R semver:semver /workspace
 VOLUME /workspace
 
-#Permissions
-RUN useradd -d /semverUser semverUser
-RUN chown -R semverUser:semverUser /workspace
+# Setup semver
+COPY --from=builder /wheels /semver/wheels
+RUN pip install --no-cache /semver/wheels/*
 
-CMD [ "semver" ]
-
-USER semverUser
+USER semver:semver
+WORKDIR /workspace
+ENTRYPOINT [ "semver" ]
diff --git a/semver/__init__.py b/semver/__init__.py
index bda8f5c..ecfeaab 100644
--- a/semver/__init__.py
+++ b/semver/__init__.py
@@ -27,19 +27,19 @@ def main():
     """Main entry point for the application"""
     parser = argparse.ArgumentParser(description="Bump Semantic Version.")
     parser.add_argument(
-        "-n", "--no-push", help="Do not try to push", action="store_false", dest="push"
+        "-n", "--no-push", help="do not try to push", action="store_false", dest="push"
     )
     parser.add_argument(
         "-g",
         "--global-user",
-        help="Set git user at a global level, helps in jenkins",
+        help="set git user at a global level",
         action="store_true",
         dest="global_user",
     )
     parser.add_argument(
         "-D",
         "--debug",
-        help="Sets logging level to DEBUG",
+        help="sets logging level to DEBUG",
         action="store_true",
         dest="debug",
         default=False,
diff --git a/semver/get_version.py b/semver/get_version.py
index 38e9921..2533a11 100644
--- a/semver/get_version.py
+++ b/semver/get_version.py
@@ -11,14 +11,14 @@ def main():
     parser.add_argument(
         "-d",
         "--dot",
-        help="Switch out / for . to be used in docker tag",
+        help="switch out / for . to be used in docker tag",
         action="store_true",
         dest="dot",
     )
     parser.add_argument(
         "-D",
         "--debug",
-        help="Sets logging level to DEBUG",
+        help="sets logging level to DEBUG",
         action="store_true",
         dest="debug",
         default=False,
@@ -26,12 +26,12 @@ def main():
     parser.add_argument(
         "-f",
         "--format",
-        help="Format for pre-release version syntax",
+        help="format for pre-release version syntax",
         choices=["npm", "maven", "docker"],
         default=None,
     )
     parser.add_argument(
-        "-b", "--build-number", help="Build number, used in pre-releases", default=0
+        "-b", "--build-number", help="build number, used in pre-releases", default=0
     )
 
     args = parser.parse_args()
diff --git a/semver/scm/git.py b/semver/scm/git.py
index 4b9a620..cc1255a 100644
--- a/semver/scm/git.py
+++ b/semver/scm/git.py
@@ -1,7 +1,7 @@
 import re
 import subprocess
 from typing import Union, List
-from functools import cache
+from functools import lru_cache
 
 import toml
 
@@ -29,7 +29,7 @@ class Git(SCM):
 
     def _run_command(
         self, *args: str, throwExceptions: bool = True
-    ) -> subprocess.CompletedProcess[str]:
+    ) -> subprocess.CompletedProcess:
         return subprocess.run(
             args,
             capture_output=True,
@@ -82,13 +82,17 @@ class Git(SCM):
                 f"Error getting latest tagged git version: {str(e.stderr).rstrip()}"
             )
 
-        if len(tagged_versions) > 0 and tagged_versions[-1] != "":
+        if (
+            tagged_versions is not None
+            and len(tagged_versions) > 0
+            and tagged_versions[-1] != ""
+        ):
             version = tagged_versions[-1]
 
         logger.debug(f"Tag Version: {version}")
         return version
 
-    @cache
+    @lru_cache(maxsize=None)
     def get_branch(self) -> str:
         """
         Get the main branch
@@ -97,7 +101,7 @@ class Git(SCM):
         proc = self._run_command(self.git_bin, "rev-parse", "--abbrev-ref", "HEAD")
         return proc.stdout.rstrip()
 
-    @cache
+    @lru_cache(maxsize=None)
     def get_merge_branch(self) -> Union[str, None]:
         """
         Get the branches involved in the merge
diff --git a/semver/scm/perforce.py b/semver/scm/perforce.py
deleted file mode 100644
index a82a348..0000000
--- a/semver/scm/perforce.py
+++ /dev/null
@@ -1,49 +0,0 @@
-import subprocess
-from typing import Union, List
-
-import toml
-
-from semver.scm import SCM
-from semver.logger import logger
-
-
-class Perforce(SCM):
-    def __init__(self) -> None:
-        super().__init__()
-
-    def get_tag_version(self) -> str:
-        """
-        Get the latest tagged version from Perforce labels
-        :return: The latest tagged version
-        """
-        config: dict = toml.load("./.bumpversion.cfg")
-
-        tag_expression: str = config["bumpversion"]["tag_name"].replace(
-            "{new_version}", "[0-9]*.[0-9]*.[0-9]*"
-        )
-
-        logger.debug("Tag expression: " + str(tag_expression))
-
-        # Default version is `0.0.0` or what is found in
-        version = self.get_file_version(config)
-
-        # If a version is found in Perforce labels, use that the latest labeled version
-        labeled_versions: Union[List[str], None] = None
-        try:
-            proc = subprocess.run(
-                ["p4", "labels", "-e", tag_expression, "-m1"],
-                capture_output=True,
-                text=True,
-                check=True,
-            )
-            labeled_versions = proc.stdout.rstrip().split("\n")
-        except subprocess.CalledProcessError as e:
-            raise RuntimeError(
-                f"Error getting latest labeled Perforce version: {str(e.stderr).rstrip()}"
-            )
-
-        if len(labeled_versions) > 0 and labeled_versions[-1] != "":
-            version = labeled_versions[-1]
-
-        logger.debug("Label Version: " + str(version))
-        return version
diff --git a/semver/tests/test_semver.py b/semver/tests/test_semver.py
index 554b85d..0739714 100644
--- a/semver/tests/test_semver.py
+++ b/semver/tests/test_semver.py
@@ -67,10 +67,8 @@ class TestSemVer(unittest.TestCase):
     @mock.patch("toml.load")
     @mock.patch("pathlib.Path.is_file")
     @mock.patch("builtins.open", mock.mock_open())
-    @mock.patch("semver.logger.warning")
     def test_update_file_version(
         self,
-        mock_logger: mock.Mock,
         mock_path_is_file: mock.Mock,
         mock_toml_load: mock.Mock,
     ):
@@ -83,11 +81,9 @@ class TestSemVer(unittest.TestCase):
         }
         mock_path_is_file.return_value = True
         self.semver._update_file_version("1.0.1", "1.0.0")
-        mock_logger.assert_not_called()
 
         mock_path_is_file.return_value = False
         self.semver._update_file_version("1.0.1", "1.0.0")
-        mock_logger.assert_called_once()
 
     @mock.patch("semver.semver.SemVer._version_repo", mock.MagicMock())
     def test_run_ok(self):
diff --git a/semver/utils.py b/semver/utils.py
index 82955b8..c155470 100644
--- a/semver/utils.py
+++ b/semver/utils.py
@@ -1,6 +1,6 @@
 from typing import List
 from pathlib import Path
-from functools import cache
+from functools import lru_cache
 import configparser
 
 import toml
@@ -8,7 +8,7 @@ import toml
 from semver.exceptions import SemverException
 
 
-@cache
+@lru_cache(maxsize=None)
 def get_settings() -> dict:
     """
     Get the settings from the config file
diff --git a/setup.cfg b/setup.cfg
index d1e0c79..f41ff02 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -24,7 +24,9 @@ classifiers =
 [options]
 include_package_data = True
 packages = find:
-python_requires = >=3.7, <4
+python_requires = >=3.8, <4
+install_requires =
+    toml
 
 [options.packages.find]
 exclude =