diff --git a/.editorconfig b/.editorconfig
index 8abfc45..76f8299 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -29,9 +29,11 @@ end_of_line                 = crlf
 indent_size                 = 4
 continuation_indent_size    = 4
 
-[Makefile]
-indent_style                = tab
-end_of_line                 = lf
-
-[.gitmodules]
-indent_style = tab
+[poetry.lock]
+# generated file.
+trim_trailing_whitespace    = unset
+insert_final_newline        = unset
+indent_style                = unset
+indent_size                 = unset
+continuation_indent_size    = unset
+max_line_length             = off
diff --git a/.github/workflows/pull-request.yml b/.github/workflows/pull-request.yml
new file mode 100644
index 0000000..1e22587
--- /dev/null
+++ b/.github/workflows/pull-request.yml
@@ -0,0 +1,27 @@
+name: CI
+on: pull_request
+
+jobs:
+  ci:
+    strategy:
+      fail-fast: false
+      matrix:
+        #python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10"]
+        poetry-version: ["1.7.1"]
+        os: [ubuntu-22.04]
+    name: Python ${{ matrix.python-version }}
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install poetry
+        run: pipx install poetry
+      - uses: actions/setup-python@v5
+        id: cp310
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: 'poetry'
+      - run: echo '${{ steps.cp310.outputs.python-version }}'
+      - run: echo 'Cache Hit ${{ steps.cp310.outputs.cache-hit }}'
+      - run: poetry install
+      - run: poetry run python3 -m unittest discover
diff --git a/.gitignore b/.gitignore
index efbcd1e..ca90fc0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 /dist/
-/poetry.lock
 __pycache__/
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..22ee940
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,138 @@
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+
+[[package]]
+name = "coverage"
+version = "7.4.2"
+description = "Code coverage measurement for Python"
+optional = false
+python-versions = ">=3.8"
+files = [
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+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "markdown"
+version = "3.5.2"
+description = "Python implementation of John Gruber's Markdown."
+optional = false
+python-versions = ">=3.8"
+files = [
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+[package.dependencies]
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+pyyaml = {version = "*", optional = true, markers = "extra == \"testing\""}
+
+[package.extras]
+docs = ["mdx-gh-links (>=0.2)", "mkdocs (>=1.5)", "mkdocs-gen-files", "mkdocs-literate-nav", "mkdocs-nature (>=0.6)", "mkdocs-section-index", "mkdocstrings[python]"]
+testing = ["coverage", "pyyaml"]
+
+[[package]]
+name = "pyyaml"
+version = "6.0.1"
+description = "YAML parser and emitter for Python"
+optional = false
+python-versions = ">=3.6"
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+]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.10"
+content-hash = "1c6964c5d6cb29b3e3d7c9ce17a00e63fa5c4c13a9247cc73d3cc1875369ec88"
diff --git a/poetry.toml b/poetry.toml
new file mode 100644
index 0000000..53b35d3
--- /dev/null
+++ b/poetry.toml
@@ -0,0 +1,3 @@
+[virtualenvs]
+create = true
+in-project = true
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..de2b1e5
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+markdown==3.5.2 ; python_version >= "3.10" and python_version < "4.0" \
+    --hash=sha256:d43323865d89fc0cb9b20c75fc8ad313af307cc087e84b657d9eec768eddeadd \
+    --hash=sha256:e1ac7b3dc550ee80e602e71c1d168002f062e49f1b11e26a36264dafd4df2ef8
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 849acf2..0000000
--- a/setup.py
+++ /dev/null
@@ -1,7 +0,0 @@
-from setuptools import setup
-setup(
-    name='ddmarkdown',
-    version='1.0.3',
-    py_modules=['ddmarkdown'],
-    install_requires = ['markdown>=3.0'],
-)