diff --git a/.github/actions/pydpkg/action.yml b/.github/actions/pydpkg/action.yml
index d561f5ced..e1552cee2 100644
--- a/.github/actions/pydpkg/action.yml
+++ b/.github/actions/pydpkg/action.yml
@@ -1,6 +1,6 @@
 inputs:
   workaround:
-    default: false
+    default: ""
     required: true
   path:
     default: "debian"
@@ -34,7 +34,7 @@ runs:
        chmod --changes +x ${{ inputs.path }}/gunicorn-21.2.0/debian/control
        ls -l ${{ inputs.path }}/gunicorn-21.2.0/
    - name: prepare deb source dir (${{ inputs.path }})
-     if: ${{ inputs.workaround }}
+     if: ${{ inputs.workaround != "" }}
      shell: bash
      run: |
        echo 'extend-diff-ignore = "^setup\.cfg$"' >> ${{ inputs.path }}/gunicorn-21.2.0/debian/source/options
diff --git a/.github/workflows/packaging.yml b/.github/workflows/packaging.yml
index a5fa59ffd..102609015 100644
--- a/.github/workflows/packaging.yml
+++ b/.github/workflows/packaging.yml
@@ -46,13 +46,13 @@ jobs:
         uses: ./source/.github/actions/pydpkg
         with:
           path: debian-workaround
-          workaround: true
+          workaround: "all"
       - name: "Build dpkg package (default)"
         uses: ./source/.github/actions/pydpkg
         continue-on-error: true
         with:
           path: debian
-          workaround: false
+          workaround: ""
       - uses: actions/upload-artifact@v4
         with:
           path: |
diff --git a/MANIFEST.in b/MANIFEST.in
index edf1811ef..f46537d59 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,10 +1,7 @@
-include .gitignore
 include LICENSE
 include NOTICE
 include README.rst
 include THANKS
-include requirements_dev.txt
-include requirements_test.txt
 recursive-include tests *
 recursive-include examples *
 recursive-include docs *
diff --git a/Makefile b/Makefile
index 5624704c5..51847da1f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,6 @@
 build:
 	virtualenv venv
-	venv/bin/pip install -e .
-	venv/bin/pip install -r requirements_dev.txt
+	venv/bin/pip install -e .[dev,testing]
 
 test:
 	venv/bin/python -m pytest
diff --git a/README.md b/README.md
index 41bdb577f..7cbf63203 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ details.
 
 ### CI
 
-[![CI:buildpackage](https://github.com/pajod/gunicorn/actions/workflows/buildpackage.yml/badge.svg)](https://github.com/pajod/gunicorn/actions/workflows/buildpackage.yml)
+[![CI:packaging](https://github.com/pajod/gunicorn/actions/workflows/packaging.yml/badge.svg)](https://github.com/pajod/gunicorn/actions/workflows/packaging.yml)
 [![CI:CodeQL](https://github.com/pajod/gunicorn/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/pajod/gunicorn/actions/workflows/github-code-scanning/codeql)
 [![CI:lint](https://github.com/pajod/gunicorn/actions/workflows/lint.yml/badge.svg)](https://github.com/pajod/gunicorn/actions/workflows/lint.yml)
 [![CI:tox](https://github.com/pajod/gunicorn/actions/workflows/tox.yml/badge.svg)](https://github.com/pajod/gunicorn/actions/workflows/tox.yml)
diff --git a/pyproject.toml b/pyproject.toml
index 3901e3fe0..701978b49 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -107,6 +107,15 @@ testing = [
     # pytest 7.2.0 starts using Python 3.11 stdlib tomllib
     "pytest>=7.2.0",
 ]
+dev = [
+    # setuptools v68.0 fails hard on invalid pyproject.toml
+    # which a developer would want to know
+    # otherwise, oldest known-working version is 61.2
+    "setuptools>=68.0",
+    "sphinx",
+    "sphinx_rtd_theme",
+]
+
 
 [project.scripts]
 # duplicates "python -m gunicorn" handling in __main__.py
diff --git a/requirements_dev.txt b/requirements_dev.txt
deleted file mode 100644
index 1d8c01291..000000000
--- a/requirements_dev.txt
+++ /dev/null
@@ -1,9 +0,0 @@
--r requirements_test.txt
-
-# setuptools v68.0 fails hard on invalid pyproject.toml
-# which a developer would want to know
-# otherwise, oldest known-working version is 61.2
-setuptools>=68.0
-
-sphinx
-sphinx_rtd_theme
diff --git a/requirements_test.txt b/requirements_test.txt
deleted file mode 100644
index 9d0701969..000000000
--- a/requirements_test.txt
+++ /dev/null
@@ -1,8 +0,0 @@
-gevent
-eventlet
-coverage
-# pytest 8.0 intends to drop Python 3.7
-# pytest 7.2.0 starts using Python 3.11 stdlib tomllib
-pytest>=7.2.0
-# pytest 6.0 supports modern importlib, so we do not need pytest-cov to fixup sys.path
-# pytest-cov