diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 169eb84..af08c19 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -120,7 +120,6 @@ jobs:
       - name: Install Python dependencies
         run: |
           ./venv/bin/python -m pip install --upgrade pip
-          ./venv/bin/python -m pip install -r requirements-dev.txt
       - name: Install package manager dependencies
         run: |
           sudo apt-get update
@@ -210,13 +209,12 @@ jobs:
       - name: Install Python dependencies
         run: |
           ./venv/bin/python -m pip install --upgrade pip
-          ./venv/bin/python -m pip install -r requirements-dev.txt
       - name: Set up dependencies
         run:
           sudo apt-get install clang-format
       - name: Install Package
         run: |
-          ./venv/bin/python -m pip install -e .
+          ./venv/bin/python -m pip install -e ".[dev]"
         env:
           PREFIX: blazingmq_artifacts
           PYTHON: ./venv/bin/python
@@ -260,7 +258,6 @@ jobs:
       - name: Install Python dependencies
         run: |
           ./venv/bin/python3 -m pip install --upgrade pip
-          ./venv/bin/python3 -m pip install -r requirements-dev.txt
       - name: Setup Core Dumps config
         run: |
           sudo mkdir /cores
diff --git a/Makefile b/Makefile
index 543effc..16763ba 100644
--- a/Makefile
+++ b/Makefile
@@ -38,13 +38,11 @@ install-sdist: dist
 
 .PHONY: coverage-install
 coverage-install:
-	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -r requirements-test-coverage.txt
-	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -e .
+	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -e ".[coverage]"
 
 .PHONY: test-install
 test-install:
-	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -r requirements-test.txt
-	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -e .
+	$(ENV) CYTHON_TEST_MACROS=1 $(PIP_INSTALL) -e ".[test]"
 
 .PHONY: build
 build:
@@ -64,7 +62,7 @@ dist:
 
 .PHONY: doc-deps
 doc-deps:
-	$(PIP_INSTALL) -r requirements-lint-docs.txt
+	$(PIP_INSTALL) -e ".[docs]"
 
 .PHONY: docs
 docs:
diff --git a/docs/BUILD.md b/docs/BUILD.md
index 407b256..1e57470 100644
--- a/docs/BUILD.md
+++ b/docs/BUILD.md
@@ -67,7 +67,7 @@ Additional `make` targets are provided, such as for test coverage.
 Dependencies for these can be installed as follows:
 
 ```shell
-python3.9 -m pip install -r requirements-dev.txt
+python3.9 -m pip install -e ".[dev]"
 ```
 
 And now you should be able to run `make coverage`.
diff --git a/news/77.misc.rst b/news/77.misc.rst
new file mode 100644
index 0000000..97753f9
--- /dev/null
+++ b/news/77.misc.rst
@@ -0,0 +1 @@
+Move development dependencies from ``requirements*.txt`` files into ``pyproject.toml`` optional-dependencies.
diff --git a/pyproject.toml b/pyproject.toml
index e7ddb44..345ca3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,6 +34,36 @@ classifiers = [
     "Typing :: Typed",
 ]
 
+[project.optional-dependencies]
+test = [
+    "mock",
+    "pytest",
+    "pkgconfig",
+]
+coverage = [
+    "blazingmq[test]",
+    "pytest-cov",
+    "Cython>=3,<4",
+]
+lint = [
+    "black",
+    "flake8",
+    "isort",
+    "mypy",
+    "types-enum34",
+]
+docs = [
+    "recommonmark",
+    "Sphinx",
+    "sphinx_rtd_theme",
+    "towncrier",
+]
+dev = [
+    "blazingmq[test,coverage,lint,docs]",
+    "tox",
+    "setuptools",
+]
+
 [tool.setuptools]
 packages = ["blazingmq"]
 package-dir = {"" = "src"}
diff --git a/requirements-dev.txt b/requirements-dev.txt
deleted file mode 100644
index 43da4bf..0000000
--- a/requirements-dev.txt
+++ /dev/null
@@ -1,5 +0,0 @@
--r requirements-lint-docs.txt
--r requirements-test.txt
--r requirements-test-coverage.txt
-tox
-setuptools
diff --git a/requirements-lint-docs.txt b/requirements-lint-docs.txt
deleted file mode 100644
index cdce429..0000000
--- a/requirements-lint-docs.txt
+++ /dev/null
@@ -1,9 +0,0 @@
-black
-flake8
-isort
-mypy
-recommonmark
-Sphinx
-sphinx_rtd_theme
-towncrier
-types-enum34
diff --git a/requirements-test-coverage.txt b/requirements-test-coverage.txt
deleted file mode 100644
index 811296f..0000000
--- a/requirements-test-coverage.txt
+++ /dev/null
@@ -1,4 +0,0 @@
--r requirements-test.txt
-pytest-cov
-Cython >= 0.29, <3; python_version < "3.8"
-Cython >=3, <4; python_version >= "3.8"
diff --git a/requirements-test.txt b/requirements-test.txt
deleted file mode 100644
index 7fd0094..0000000
--- a/requirements-test.txt
+++ /dev/null
@@ -1,3 +0,0 @@
-mock
-pytest
-pkgconfig
diff --git a/tox.ini b/tox.ini
index 5e91012..02cd559 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ whitelist_externals = make
 
 deps =
     pip>=19.0.3
-    -rrequirements-test.txt
+extras = test
 
 commands =
     {basepython} -c 'import sys; print("\n".join(sys.path))'
@@ -37,7 +37,7 @@ basepython = python3.14
 [testenv:py314-cov]
 usedevelop = True
 commands = {[testenv]commands_cov}
-deps = -rrequirements-test-coverage.txt
+extras = coverage
 
 [testenv:lint]
 description =  Run lint checker on Python files
@@ -71,6 +71,6 @@ commands = {basepython} -m black --check --verbose src tests
 [testenv:docs]
 description = Generate library documentation
 basepython = python3.14
-deps = -rrequirements-lint-docs.txt
+extras = docs
 commands = make -C docs html
            {basepython} -c 'print("documentation available under file://{toxworkdir}/docs_out/index.html")'