diff --git a/.github/scripts/install_ubuntu_deps.sh b/.github/scripts/install_ubuntu_deps.sh
index 31a3751940..ea2035017f 100755
--- a/.github/scripts/install_ubuntu_deps.sh
+++ b/.github/scripts/install_ubuntu_deps.sh
@@ -9,6 +9,4 @@ sudo apt-get install -y libpng-dev
 wget -q https://lilypond.org/download/binaries/linux-64/lilypond-2.22.1-1.linux-64.sh
 sh lilypond-2.22.1-1.linux-64.sh --batch
 export PATH=/home/runner/bin:$PATH
-pip3 install wheel
-pip3 install -r requirements_dev.txt
 python3 -m compileall music21
diff --git a/.github/workflows/maincheck.yml b/.github/workflows/maincheck.yml
index 7b21a16de4..25bc3c8b5f 100644
--- a/.github/workflows/maincheck.yml
+++ b/.github/workflows/maincheck.yml
@@ -16,10 +16,19 @@ jobs:
             matrix:
                 python-version: [3.11, 3.12, 3.13, 3.14]
         steps:
+        - uses: actions/checkout@v4
         - uses: actions/setup-python@v4
           with:
               python-version: ${{ matrix.python-version }}
-        - uses: actions/checkout@v4
+        - name: Install uv
+          uses: astral-sh/setup-uv@v7
+          with:
+              enable-cache: true
+              cache-dependency-glob: |
+                  pyproject.toml
+        - name: Install dependencies
+          run: |
+              uv pip install --system -e '.[dev]'
         - name: Install Ubuntu dependencies
           run: ./.github/scripts/install_ubuntu_deps.sh
         - name: Setup Lilypond
@@ -42,19 +51,22 @@ jobs:
               with:
                   python-version: '3.14'
                   cache: 'pip'
+            - name: Install uv
+              uses: astral-sh/setup-uv@v7
+              with:
+                  enable-cache: true
+                  cache-dependency-glob: |
+                      pyproject.toml
             - name: Install dependencies
               run: |
-                  python -m pip install --upgrade pip
-                  pip install wheel
-                  pip install -r requirements.txt
-                  pip install -r requirements_dev.txt
+                  uv pip install --system -e '.[dev]'
             - name: Install music21 in editable mode
               run: |
-                  python -m pip install -e .
+                  uv pip install --system -e .
             - name: Lint with pylint
               run: |
-                  pylint -j0 music21
-                  pylint -j0 documentation
+                  uv run pylint -j0 music21
+                  uv run pylint -j0 documentation
 
     ruff:
         runs-on: ubuntu-latest
@@ -65,16 +77,19 @@ jobs:
               with:
                   python-version: '3.14'
                   cache: 'pip'
+            - name: Install uv
+              uses: astral-sh/setup-uv@v7
+              with:
+                  enable-cache: true
+                  cache-dependency-glob: |
+                      pyproject.toml
             - name: Install dependencies
               run: |
-                  python -m pip install --upgrade pip
-                  pip install wheel
-                  pip install -r requirements.txt
-                  pip install -r requirements_dev.txt
+                  uv pip install --system -e '.[dev]'
             - name: Code-style etc. with Ruff
               run: |
-                  ruff check music21
-                  ruff check documentation
+                  uv run ruff check music21
+                  uv run ruff check documentation
 
     mypy:
         runs-on: ubuntu-latest
@@ -85,11 +100,15 @@ jobs:
               with:
                   python-version: '3.14'
                   cache: 'pip'
+            - name: Install uv
+              uses: astral-sh/setup-uv@v7
+              with:
+                  enable-cache: true
+                  cache-dependency-glob: |
+                      pyproject.toml
             - name: Install dependencies
               run: |
-                  pip install wheel
-                  python -m pip install -r requirements.txt
-                  python -m pip install -r requirements_dev.txt
+                  uv pip install --system -e '.[dev]'
             - name: Type-check all modules with mypy
               run: |
-                  mypy music21
+                  uv run mypy music21
diff --git a/documentation/nbvalNotebook.py b/documentation/nbvalNotebook.py
index 613a8c2103..26aee567bf 100644
--- a/documentation/nbvalNotebook.py
+++ b/documentation/nbvalNotebook.py
@@ -76,11 +76,13 @@ def runOne(nbFile):
     us['musescoreDirectPNGPath'] = '/skip' + str(museScore)
 
     # this config file changes 0x39f3a0 to 0xADDRESS.
-    sanitize_fn = str(common.getRootFilePath()
-                      / 'documentation'
-                      / 'docbuild'
-                      / 'nbval-sanitize.cfg'
-                      )
+    sanitize_fn = str(
+        common.getRootFilePath()
+        / 'documentation'
+        / 'docbuild'
+        / 'nbval-sanitize.cfg'
+    )
+
     try:
         retVal = subprocess.run(
             ['pytest',
diff --git a/pyproject.toml b/pyproject.toml
index a6cf23be56..0ff7bbd428 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,6 +53,28 @@ dependencies = [
     "webcolors>=1.5",
 ]
 
+[project.optional-dependencies]
+dev = [
+    'coverage',
+    'coveralls',
+    'docutils',
+    'hatch',
+    'hatchling',
+    'jupyter',
+    'mypy>=1.16.0',
+    'nbconvert',
+    'nbval',
+    'pylint>=3.2.0',
+    'pytest',
+    'python-Levenshtein',
+    'ruff',
+    'scipy',
+    'sphinx',
+    'twine',
+    'types-requests',
+    'wheel',
+]
+
 [[project.authors]]
 name = "Michael Scott Asato Cuthbert"
 email = "michael.asato.cuthbert@gmail.com"