diff --git a/.github/workflows/ci-windows-powershell.yml b/.github/workflows/ci-windows-powershell.yml
index f8aeef5b4..de493e02b 100644
--- a/.github/workflows/ci-windows-powershell.yml
+++ b/.github/workflows/ci-windows-powershell.yml
@@ -38,7 +38,7 @@ jobs:
 
     - name: "Windows specific: Install StrictDoc's dependencies"
       run: |
-        python developer/pip_install_strictdoc_deps.py
+        pip install .
 
     - name: "Windows specific: Install Check dependencies (everything for lint + test)"
       run: |
diff --git a/.github/workflows/ci-windows.yml b/.github/workflows/ci-windows.yml
index ab86f5ea6..0f8a4a1f1 100644
--- a/.github/workflows/ci-windows.yml
+++ b/.github/workflows/ci-windows.yml
@@ -38,7 +38,7 @@ jobs:
 
     - name: "Windows specific: Install StrictDoc's dependencies"
       run: |
-        python developer/pip_install_strictdoc_deps.py
+        pip install .
 
     - name: "Windows specific: Install Check dependencies (everything for lint + test)"
       run: |
diff --git a/.github/workflows/end2end-tests.yml b/.github/workflows/end2end-tests.yml
index 4ecd3a075..f038bcd6e 100644
--- a/.github/workflows/end2end-tests.yml
+++ b/.github/workflows/end2end-tests.yml
@@ -100,7 +100,7 @@ jobs:
 
     - name: "Windows specific: Install StrictDoc's dependencies"
       run: |
-        python developer/pip_install_strictdoc_deps.py
+        pip install .
 
     - name: "Windows specific: Install Check dependencies (everything for test)"
       run: |
diff --git a/developer/pip_install_strictdoc_deps.py b/developer/pip_install_strictdoc_deps.py
deleted file mode 100644
index d4ca0a30f..000000000
--- a/developer/pip_install_strictdoc_deps.py
+++ /dev/null
@@ -1,101 +0,0 @@
-import importlib.metadata as importlib_metadata
-import os
-import subprocess
-import sys
-import tempfile
-
-import toml
-from packaging.requirements import Requirement
-
-
-class PackageNotFound(Exception):
-    pass
-
-
-class PackageVersionConflict(Exception):
-    pass
-
-
-# A simplified version inspired by:
-# https://github.com/HansBug/hbutils/blob/37879186c489bced2791309c43d131f1703b7bd4/hbutils/system/python/package.py#L171
-def check_if_package_installed(package_name: str):
-    requirement: Requirement = Requirement(package_name)
-    try:
-        version = importlib_metadata.distribution(requirement.name).version
-    except importlib_metadata.PackageNotFoundError:
-        raise PackageNotFound(requirement) from None
-    if not requirement.specifier.contains(version):
-        raise PackageVersionConflict(version)
-
-
-print(  # noqa: T201
-    "pip_install_strictdoc_deps.py: "
-    "checking if the current Python environment has all packages installed"
-    ".",
-    flush=True,
-)
-
-pyproject_content = toml.load("pyproject.toml")
-
-
-# The development dependencies are ignored, because they are managed in tox.ini.
-dependencies = pyproject_content["project"]["dependencies"]
-
-needs_installation = False
-
-for dependency in dependencies:
-    try:
-        check_if_package_installed(dependency)
-    except PackageNotFound:
-        print(  # noqa: T201
-            f"pip_install_strictdoc_deps.py: "
-            f"Package is not installed: '{dependency}'.",
-            flush=True,
-        )
-        needs_installation = True
-        break
-    except PackageVersionConflict as exception_:
-        print(  # noqa: T201
-            (
-                f"pip_install_strictdoc_deps.py: version conflict between "
-                f"StrictDoc's requirement '{dependency}' "
-                f"and the already installed package: "
-                f"{exception_.args[0]}."
-            ),
-            flush=True,
-        )
-        needs_installation = True
-        break
-
-if not needs_installation:
-    print(  # noqa: T201
-        "pip_install_strictdoc_deps.py: all packages seem to be installed.",
-        flush=True,
-    )
-    sys.exit(0)
-
-print(  # noqa: T201
-    "pip_install_strictdoc_deps.py: will install packages.", flush=True
-)
-
-all_packages = "\n".join(dependencies) + "\n"
-
-with tempfile.TemporaryDirectory() as tmp_dir:
-    with open(
-        os.path.join(tmp_dir, "requirements.txt"), "w", encoding="utf8"
-    ) as tmp_requirements_txt_file:
-        tmp_requirements_txt_file.write(all_packages)
-
-    command = [
-        sys.executable,
-        "-m",
-        "pip",
-        "install",
-        "-r",
-        tmp_requirements_txt_file.name,
-    ]
-
-    result = subprocess.run(command, check=True, encoding="utf8")
-    print(  # noqa: T201
-        f"'pip install' command exited with: {result.returncode}", flush=True
-    )
diff --git a/docs/sphinx/source/strictdoc_11_developer_guide.rst b/docs/sphinx/source/strictdoc_11_developer_guide.rst
index 030f650ef..b0268d993 100644
--- a/docs/sphinx/source/strictdoc_11_developer_guide.rst
+++ b/docs/sphinx/source/strictdoc_11_developer_guide.rst
@@ -81,7 +81,7 @@ in StrictDoc's source code. Otherwise, install StrictDoc as a normal Pip package
 .. code-block::
 
     git clone https://github.com/strictdoc-project/strictdoc.git && cd strictdoc
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     python3 strictdoc/cli/main.py
 
 The ``pip_install_strictdoc_deps.py`` installs all dependencies of StrictDoc, but not StrictDoc itself.
diff --git a/docs/strictdoc_11_developer_guide.sdoc b/docs/strictdoc_11_developer_guide.sdoc
index 9c3cdc472..1007fd6bc 100644
--- a/docs/strictdoc_11_developer_guide.sdoc
+++ b/docs/strictdoc_11_developer_guide.sdoc
@@ -55,12 +55,6 @@ On Linux Ubuntu:
 .. code:: bash
 
     sudo apt install tidy
-
-From the core Python packages, StrictDoc needs Invoke, Tox and TOML:
-
-.. code:: bash
-
-    pip install invoke tox toml
 <<<
 
 [SECTION]
@@ -89,13 +83,28 @@ STATEMENT: >>>
 **Note:** Use this way of installing StrictDoc only if you want to make changes
 in StrictDoc's source code. Otherwise, install StrictDoc as a normal Pip package by running ``pip install strictdoc``.
 
-.. code-block::
+1. Clone the project.
+2. Create a virtual environment.
+3. Install dependencies.
+4. Run the StrictDoc CLI.
+
+.. code:: bash
 
     git clone https://github.com/strictdoc-project/strictdoc.git && cd strictdoc
-    python developer/pip_install_strictdoc_deps.py
+    python3 -m venv .venv
+    . ./.venv/bin/activate
+    pip install .
     python3 strictdoc/cli/main.py
 
-The ``pip_install_strictdoc_deps.py`` installs all dependencies of StrictDoc, but not StrictDoc itself.
+**Note:** Windows users, substitute: ``.\.venv\Scripts\activate``
+
+This installs all dependencies of StrictDoc, but not StrictDoc itself.
+
+To also install the dev dependencies specified in ``pyproject.toml``:
+
+.. code:: bash
+
+    pip install ".[development]"
 <<<
 
 [/SECTION]
diff --git a/tox.ini b/tox.ini
index b62942667..a09d44bc5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -18,7 +18,7 @@ deps =
     # Reload files when changed (used by 'invoke watch')
     watchdog>=2.1.7
 commands =
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     {posargs}
 
 [testenv:{py37,py38,py39,py310,py311,py312}-check]
@@ -31,7 +31,7 @@ pass_env=
     CHROMEWEBDRIVER
     STRICTDOC_CACHE_DIR
 commands =
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     {posargs}
 
 [testenv:{py37,py38,py39,py310,py311,py312}-documentation]
@@ -48,7 +48,7 @@ deps =
     sphinx>=3.2.1
     guzzle_sphinx_theme~=0.7.11
 commands =
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     {posargs}
 
 [testenv:{py37,py38,py39,py310,py311,py312}-release]
@@ -74,7 +74,7 @@ deps =
     twine
     {[testenv:py37-check]deps}
 commands =
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     {posargs}
 
 [testenv:{py37,py38,py39,py310,py311,py312}-pyinstaller]
@@ -84,5 +84,5 @@ deps =
     -rrequirements.bootstrap.txt
     pyinstaller
 commands =
-    python developer/pip_install_strictdoc_deps.py
+    pip install .
     {posargs}