diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a39d173..ab39e63 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -23,8 +23,12 @@ jobs:
         uses: actions/setup-python@v1
         with:
           python-version: ${{ matrix.python-version }}
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+        with:
+          version: 1.1.11
       - name: Install dependencies
         run: |
-          pip install -r requirements.txt --user
+          poetry install
       - name: Run tests with Nose
-        run: python -m nose --exclude=test_suite
+        run: poetry run python -m nose --exclude=test_suite
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..06726fe
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,353 @@
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+version = "1.6.4"
+description = "Backport of functools.lru_cache"
+category = "main"
+optional = false
+python-versions = ">=2.6"
+
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-black (>=0.3.7)", "pytest-mypy", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "pytest-checkdocs (>=2.4)"]
+
+[[package]]
+name = "beautifulsoup4"
+version = "4.9.3"
+description = "Screen-scraping library"
+category = "main"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
+soupsieve = [
+    {version = ">1.2,<2.0", markers = "python_version < \"3.0\""},
+    {version = ">1.2", markers = "python_version >= \"3.0\""},
+]
+
+[package.extras]
+html5lib = ["html5lib"]
+lxml = ["lxml"]
+
+[[package]]
+name = "certifi"
+version = "2021.10.8"
+description = "Python package for providing Mozilla's CA Bundle."
+category = "main"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "chardet"
+version = "4.0.0"
+description = "Universal encoding detector for Python 2 and 3"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+
+[[package]]
+name = "charset-normalizer"
+version = "2.0.10"
+description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
+category = "main"
+optional = false
+python-versions = ">=3.5.0"
+
+[package.extras]
+unicode_backport = ["unicodedata2"]
+
+[[package]]
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+version = "1.0.2"
+description = "Python function signatures from PEP362 for Python 2.6, 2.7 and 3.2+"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "html5lib"
+version = "1.1"
+description = "HTML parser based on the WHATWG HTML specification"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
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+[[package]]
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+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+
+[[package]]
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+version = "3.3"
+description = "Internationalized Domain Names in Applications (IDNA)"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+
+[[package]]
+name = "lxml"
+version = "4.7.1"
+description = "Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API."
+category = "dev"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, != 3.4.*"
+
+[package.extras]
+cssselect = ["cssselect (>=0.7)"]
+html5 = ["html5lib"]
+htmlsoup = ["beautifulsoup4"]
+source = ["Cython (>=0.29.7)"]
+
+[[package]]
+name = "mock"
+version = "2.0.0"
+description = "Rolling backport of unittest.mock for all Pythons"
+category = "dev"
+optional = false
+python-versions = "*"
+
+[package.dependencies]
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+pbr = ">=0.11"
+six = ">=1.9"
+
+[package.extras]
+docs = ["sphinx", "Pygments (<2)", "jinja2 (<2.7)", "sphinx (<1.3)"]
+test = ["unittest2 (>=1.1.0)"]
+
+[[package]]
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+category = "dev"
+optional = false
+python-versions = "*"
+
+[[package]]
+name = "pbr"
+version = "5.8.0"
+description = "Python Build Reasonableness"
+category = "dev"
+optional = false
+python-versions = ">=2.6"
+
+[[package]]
+name = "requests"
+version = "2.27.1"
+description = "Python HTTP for Humans."
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*, !=3.5.*"
+
+[package.dependencies]
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+[[package]]
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+[[package]]
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+category = "main"
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+[[package]]
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+version = "0.5.1"
+description = "Character encoding aliases for legacy web content"
+category = "main"
+optional = false
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+content-hash = "292a18d8cb934d6150f316fa9e2438c2692b40fe2994cf886d0a0ae609a26ce6"
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..0e2d6dc
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,21 @@
+[tool.poetry]
+name = "mf2py"
+version = "1.1.2"
+description = "Python Microformats2 parser"
+authors = ["Tom Morris <tom@tommorris.org>"]
+license = "MIT"
+
+[tool.poetry.dependencies]
+python = "~2.7 || >=3.6"
+html5lib = "^1.1"
+requests = "^2.27.1"
+BeautifulSoup4 = "^4.9.3"
+
+[tool.poetry.dev-dependencies]
+nose = "^1.3.7"
+lxml = "^4.7.1"
+mock = "^2.0.0"
+
+[build-system]
+requires = ["poetry-core>=1.0.0"]
+build-backend = "poetry.core.masonry.api"
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 5b942ef..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-# Keep in sync with setup.py's install_requires!
-html5lib==1.0.1
-nose==1.3.7
-mock==2.0.0
-lxml==4.6.5
-requests==2.21.0
-BeautifulSoup4==4.6.3
--e .