diff --git a/.github/workflows/check-poetry-task.yml b/.github/workflows/check-poetry-task.yml
new file mode 100644
index 0000000..400240f
--- /dev/null
+++ b/.github/workflows/check-poetry-task.yml
@@ -0,0 +1,114 @@
+name: Check Poetry
+
+env:
+  # See: https://github.com/actions/setup-python/tree/main#available-versions-of-python
+  PYTHON_VERSION: "3.11"
+
+on:
+  create:
+  push:
+    paths:
+      - ".github/workflows/check-poetry-task.ya?ml"
+      - "**/poetry.lock"
+      - "**/pyproject.toml"
+      - "Taskfile.ya?ml"
+  pull_request:
+    paths:
+      - ".github/workflows/check-poetry-task.ya?ml"
+      - "**/poetry.lock"
+      - "**/pyproject.toml"
+      - "Taskfile.ya?ml"
+  schedule:
+    # Run periodically to catch breakage caused by external changes.
+    - cron: "0 11 * * THU"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  run-determination:
+    runs-on: ubuntu-latest
+    permissions: {}
+    outputs:
+      result: ${{ steps.determination.outputs.result }}
+    steps:
+      - name: Determine if the rest of the workflow should run
+        id: determination
+        run: |
+          RELEASE_BRANCH_REGEX="^refs/heads/v[0-9]+$"
+          # The `create` event trigger doesn't support `branches` filters, so it's necessary to use Bash instead.
+          if [[
+            "${{ github.event_name }}" != "create" ||
+            "${{ github.ref }}" =~ $RELEASE_BRANCH_REGEX
+          ]]; then
+            # Run the other jobs.
+            RESULT="true"
+          else
+            # There is no need to run the other jobs.
+            RESULT="false"
+          fi
+
+          echo "result=$RESULT" >> $GITHUB_OUTPUT
+
+  validate:
+    needs: run-determination
+    if: needs.run-determination.outputs.result == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Validate pyproject.toml
+        run: task poetry:validate
+
+  check-sync:
+    needs: run-determination
+    if: needs.run-determination.outputs.result == 'true'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ env.PYTHON_VERSION }}
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Sync lockfile
+        run: task poetry:sync
+
+      - name: Check if lockfile was out of sync
+        run: |
+          git \
+            diff \
+              --color \
+              --exit-code \
+              poetry.lock
diff --git a/.github/workflows/libraries_report-size-deltas.yml b/.github/workflows/libraries_report-size-deltas.yml
index 04d0167..c232688 100644
--- a/.github/workflows/libraries_report-size-deltas.yml
+++ b/.github/workflows/libraries_report-size-deltas.yml
@@ -30,26 +30,39 @@ jobs:
         with:
           python-version: '3.11.6'
 
+      - name: Install Poetry
+        run: pip install poetry
+
       - name: Install dependencies
         run: |
-          python -m pip install --upgrade pip
-          pip install --requirement "${{ env.PYTHON_PROJECT_TESTS_PATH }}/requirements.txt"
+          poetry install \
+            --no-root
 
       - name: Lint with flake8
         run: |
-          pip install --quiet flake8
-          pip install --quiet pep8-naming
-          flake8 --config "${{ env.PYTHON_PROJECT_PATH }}/.flake8" --show-source "${{ env.PYTHON_PROJECT_PATH }}"
+          poetry run \
+            flake8 \
+              --config "${{ env.PYTHON_PROJECT_PATH }}/.flake8" \
+              --show-source \
+              "${{ env.PYTHON_PROJECT_PATH }}"
 
       - name: Run Python unit tests and record code coverage data
         run: |
           export PYTHONPATH="${{ env.PYTHON_PROJECT_PATH }}"
-          coverage run --source="${{ env.PYTHON_PROJECT_PATH }}" --module pytest "${{ env.PYTHON_PROJECT_TESTS_PATH }}"
+          poetry run \
+            coverage run \
+              --source="${{ env.PYTHON_PROJECT_PATH }}" \
+              --module pytest \
+              "${{ env.PYTHON_PROJECT_TESTS_PATH }}"
           # Generate coverage data file for consumption by `codecov/codecov-action`.
-          coverage xml -o "${{ github.workspace }}/${{ env.COVERAGE_DATA_FILENAME }}"
+          poetry run \
+            coverage xml \
+              -o "${{ github.workspace }}/${{ env.COVERAGE_DATA_FILENAME }}"
 
       - name: Display code coverage report
-        run: coverage report
+        run: |
+          poetry run \
+            coverage report
 
       # A token is used to avoid intermittent spurious job failures caused by rate limiting.
       - name: Set up Codecov upload token
diff --git a/README.md b/README.md
index 3d88641..78c446a 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,7 @@
 # `arduino/report-size-deltas` action
 
 [![Check npm status](https://github.com/arduino/report-size-deltas/actions/workflows/check-npm-task.yml/badge.svg)](https://github.com/arduino/report-size-deltas/actions/workflows/check-npm-task.yml)
+[![Check Poetry status](https://github.com/arduino/report-size-deltas/actions/workflows/check-poetry-task.yml/badge.svg)](https://github.com/arduino/report-size-deltas/actions/workflows/check-poetry-task.yml)
 [![Check Taskfiles status](https://github.com/arduino/report-size-deltas/actions/workflows/check-taskfiles.yml/badge.svg)](https://github.com/arduino/report-size-deltas/actions/workflows/check-taskfiles.yml)
 [![Tests](https://github.com/arduino/report-size-deltas/workflows/libraries/report-size-deltas%20workflow/badge.svg)](https://github.com/arduino/report-size-deltas/actions?workflow=libraries/report-size-deltas+workflow)
 [![Integration Tests](https://github.com/arduino/report-size-deltas/actions/workflows/test-integration.yml/badge.svg)](https://github.com/arduino/report-size-deltas/actions/workflows/test-integration.yml)
diff --git a/Taskfile.yml b/Taskfile.yml
index f8a5f55..1b29643 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -117,6 +117,23 @@ tasks:
     cmds:
       - poetry install --no-root
 
+  poetry:sync:
+    desc: Sync poetry.lock
+    cmds:
+      - |
+        poetry \
+          lock \
+            --no-cache \
+            --no-update
+
+  poetry:validate:
+    desc: Validate pyproject.toml
+    cmds:
+      - |
+        poetry \
+          check \
+            --lock
+
   # Make a temporary file named according to the passed TEMPLATE variable and print the path passed to stdout
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/windows-task/Taskfile.yml
   utility:mktemp-file:
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..89ab771
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,235 @@
+# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+
+[[package]]
+name = "codespell"
+version = "2.2.5"
+description = "Codespell"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "codespell-2.2.5-py3-none-any.whl", hash = "sha256:efa037f54b73c84f7bd14ce8e853d5f822cdd6386ef0ff32e957a3919435b9ec"},
+    {file = "codespell-2.2.5.tar.gz", hash = "sha256:6d9faddf6eedb692bf80c9a94ec13ab4f5fb585aabae5f3750727148d7b5be56"},
+]
+
+[package.extras]
+dev = ["Pygments", "build", "chardet", "pytest", "pytest-cov", "pytest-dependency", "ruff", "tomli"]
+hard-encoding-detection = ["chardet"]
+toml = ["tomli"]
+types = ["chardet (>=5.1.0)", "mypy", "pytest", "pytest-cov", "pytest-dependency"]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+description = "Cross-platform colored terminal text."
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,!=3.5.*,!=3.6.*,>=2.7"
+files = [
+    {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
+    {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
+]
+
+[[package]]
+name = "coverage"
+version = "7.3.3"
+description = "Code coverage measurement for Python"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "coverage-7.3.3-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:d874434e0cb7b90f7af2b6e3309b0733cde8ec1476eb47db148ed7deeb2a9494"},
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+]
+
+[package.extras]
+toml = ["tomli"]
+
+[[package]]
+name = "flake8"
+version = "6.1.0"
+description = "the modular source code checker: pep8 pyflakes and co"
+optional = false
+python-versions = ">=3.8.1"
+files = [
+    {file = "flake8-6.1.0-py2.py3-none-any.whl", hash = "sha256:ffdfce58ea94c6580c77888a86506937f9a1a227dfcd15f245d694ae20a6b6e5"},
+    {file = "flake8-6.1.0.tar.gz", hash = "sha256:d5b3857f07c030bdb5bf41c7f53799571d75c4491748a3adcd47de929e34cd23"},
+]
+
+[package.dependencies]
+mccabe = ">=0.7.0,<0.8.0"
+pycodestyle = ">=2.11.0,<2.12.0"
+pyflakes = ">=3.1.0,<3.2.0"
+
+[[package]]
+name = "iniconfig"
+version = "2.0.0"
+description = "brain-dead simple config-ini parsing"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "iniconfig-2.0.0-py3-none-any.whl", hash = "sha256:b6a85871a79d2e3b22d2d1b94ac2824226a63c6b741c88f7ae975f18b6778374"},
+    {file = "iniconfig-2.0.0.tar.gz", hash = "sha256:2d91e135bf72d31a410b17c16da610a82cb55f6b0477d1a902134b24a455b8b3"},
+]
+
+[[package]]
+name = "mccabe"
+version = "0.7.0"
+description = "McCabe checker, plugin for flake8"
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "mccabe-0.7.0-py2.py3-none-any.whl", hash = "sha256:6c2d30ab6be0e4a46919781807b4f0d834ebdd6c6e3dca0bda5a15f863427b6e"},
+    {file = "mccabe-0.7.0.tar.gz", hash = "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325"},
+]
+
+[[package]]
+name = "packaging"
+version = "23.2"
+description = "Core utilities for Python packages"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "packaging-23.2-py3-none-any.whl", hash = "sha256:8c491190033a9af7e1d931d0b5dacc2ef47509b34dd0de67ed209b5203fc88c7"},
+    {file = "packaging-23.2.tar.gz", hash = "sha256:048fb0e9405036518eaaf48a55953c750c11e1a1b68e0dd1a9d62ed0c092cfc5"},
+]
+
+[[package]]
+name = "pep8-naming"
+version = "0.13.3"
+description = "Check PEP-8 naming conventions, plugin for flake8"
+optional = false
+python-versions = ">=3.7"
+files = [
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+    {file = "pep8_naming-0.13.3-py3-none-any.whl", hash = "sha256:1a86b8c71a03337c97181917e2b472f0f5e4ccb06844a0d6f0a33522549e7a80"},
+]
+
+[package.dependencies]
+flake8 = ">=5.0.0"
+
+[[package]]
+name = "pluggy"
+version = "1.3.0"
+description = "plugin and hook calling mechanisms for python"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pluggy-1.3.0-py3-none-any.whl", hash = "sha256:d89c696a773f8bd377d18e5ecda92b7a3793cbe66c87060a6fb58c7b6e1061f7"},
+    {file = "pluggy-1.3.0.tar.gz", hash = "sha256:cf61ae8f126ac6f7c451172cf30e3e43d3ca77615509771b3a984a0730651e12"},
+]
+
+[package.extras]
+dev = ["pre-commit", "tox"]
+testing = ["pytest", "pytest-benchmark"]
+
+[[package]]
+name = "pycodestyle"
+version = "2.11.1"
+description = "Python style guide checker"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pycodestyle-2.11.1-py2.py3-none-any.whl", hash = "sha256:44fe31000b2d866f2e41841b18528a505fbd7fef9017b04eff4e2648a0fadc67"},
+    {file = "pycodestyle-2.11.1.tar.gz", hash = "sha256:41ba0e7afc9752dfb53ced5489e89f8186be00e599e712660695b7a75ff2663f"},
+]
+
+[[package]]
+name = "pyflakes"
+version = "3.1.0"
+description = "passive checker of Python programs"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pyflakes-3.1.0-py2.py3-none-any.whl", hash = "sha256:4132f6d49cb4dae6819e5379898f2b8cce3c5f23994194c24b77d5da2e36f774"},
+    {file = "pyflakes-3.1.0.tar.gz", hash = "sha256:a0aae034c444db0071aa077972ba4768d40c830d9539fd45bf4cd3f8f6992efc"},
+]
+
+[[package]]
+name = "pytest"
+version = "7.4.3"
+description = "pytest: simple powerful testing with Python"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "pytest-7.4.3-py3-none-any.whl", hash = "sha256:0d009c083ea859a71b76adf7c1d502e4bc170b80a8ef002da5806527b9591fac"},
+    {file = "pytest-7.4.3.tar.gz", hash = "sha256:d989d136982de4e3b29dabcc838ad581c64e8ed52c11fbe86ddebd9da0818cd5"},
+]
+
+[package.dependencies]
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+
+[package.extras]
+testing = ["argcomplete", "attrs (>=19.2.0)", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "setuptools", "xmlschema"]
+
+[[package]]
+name = "pytest-mock"
+version = "3.12.0"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+optional = false
+python-versions = ">=3.8"
+files = [
+    {file = "pytest-mock-3.12.0.tar.gz", hash = "sha256:31a40f038c22cad32287bb43932054451ff5583ff094bca6f675df2f8bc1a6e9"},
+    {file = "pytest_mock-3.12.0-py3-none-any.whl", hash = "sha256:0972719a7263072da3a21c7f4773069bcc7486027d7e8e1f81d98a47e701bc4f"},
+]
+
+[package.dependencies]
+pytest = ">=5.0"
+
+[package.extras]
+dev = ["pre-commit", "pytest-asyncio", "tox"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "3.11.*"
+content-hash = "3de9d59b8556c6915aa74bf390e236d29d963f736de639c03ad2baf6f57da606"
diff --git a/pyproject.toml b/pyproject.toml
index cf0186b..b5f60c3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,6 +9,11 @@ python = "3.11.*"
 
 [tool.poetry.group.dev.dependencies]
 codespell = "2.2.5"
+coverage = "7.3.3"
+flake8 = "6.1.0"
+pep8-naming = "0.13.3"
+pytest = "7.4.3"
+pytest-mock = "3.12.0"
 
 [build-system]
 requires = ["poetry-core"]
diff --git a/reportsizedeltas/tests/requirements.txt b/reportsizedeltas/tests/requirements.txt
deleted file mode 100644
index a8507f9..0000000
--- a/reportsizedeltas/tests/requirements.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-coverage==7.3.3
-pytest==7.4.3
-pytest-mock==3.12.0