diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c0b24b9..e2192e4 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -172,10 +172,7 @@ The project's CLI is not using click because it is an external dependency. The g
 │   ├── __main__.py          # The entry point for the project
 │   └── VERSION              # The version for the project is kept in a static file
 ├── README.md                # The main readme for the project
-├── setup.py                 # The setup.py file for installing and packaging the project
-├── requirements.txt         # An empty file to hold the requirements for the project
-├── requirements-test.txt    # List of requirements for testing and devlopment
-├── setup.py                 # The setup.py file for installing and packaging the project
+├── pyproject.toml           # Configuration file used by packaging tools
 └── tests                    # Unit tests for the project (add mote tests files here)
     ├── conftest.py          # Configuration, hooks and fixtures for pytest
     ├── __init__.py          # This tells Python that this is a test package
diff --git a/MANIFEST.in b/MANIFEST.in
index 731ca3e..4edf8c1 100644
--- a/MANIFEST.in
+++ b/MANIFEST.in
@@ -1,5 +1,4 @@
 include LICENSE
 include HISTORY.md
-include requirements
 graft tests
 graft earth_osm
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 31fb843..44cd7c4 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@ show:		## Show the current environment.
 .PHONY: install
 install:		## Install the project in dev mode.
 	@echo "Don't forget to run 'make virtualenv' if you got errors."
-	$(ENV_PREFIX)pip install -e .[test]
+	$(ENV_PREFIX)pip install -e .[dev]
 
 .PHONY: fmt
 fmt:		## Format code using black & isort.
@@ -67,7 +67,7 @@ virtualenv:		## Create a virtual environment.
 	@rm -rf .venv
 	@python3 -m venv .venv
 	@./.venv/bin/pip install -U pip
-	@./.venv/bin/pip install -e .[test]
+	@./.venv/bin/pip install -e .[dev]
 	@echo
 	@echo "!!! Please run 'source .venv/bin/activate' to enable the environment !!!"
 
@@ -90,7 +90,7 @@ api-docs:		## Generate the API documentation.
 		echo "There are uncommitted changes. Stash or commit changes first"; \
 	else \
 		echo "Generating API documentation..."; \
-		$(ENV_PREFIX)pip install -r requirements-docs.txt; \
+		$(ENV_PREFIX)pip install -r .[docs]; \
 		$(ENV_PREFIX)lazydocs \
 			--output-path="./docs/api-docs" \
 			--overview-file="README.md" \
diff --git a/README.md b/README.md
index b33d6a8..3334811 100644
--- a/README.md
+++ b/README.md
@@ -143,7 +143,7 @@ To contribute to earth-osm, follow these steps:
 3. Install the development dependencies:
    ```bash
    pip install git+https://github.com/pypsa-meets-earth/earth-osm.git
-   pip install -r requirements-test.txt
+   pip install -r .[test]
    ```
 
 4. Read the [CONTRIBUTING.md](CONTRIBUTING.md) file for more detailed information on how to contribute to the project.
diff --git a/pyproject.toml b/pyproject.toml
index dd1b32e..6158954 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,7 +33,7 @@ Homepage = "https://github.com/pypsa-meets-earth/earth-osm/"
 Issues = "https://github.com/pypsa-meets-earth/earth-osm/issues"
 
 [project.optional-dependencies]
-test = [
+dev = [
     "pytest",
     "coverage",
     "flake8",
@@ -46,6 +46,14 @@ test = [
     "mkdocs",
     "osmium",
 ]
+docs = [
+    "lazydocs",
+    "mkdocs",
+    "mkdocs-material",
+    "mkdocs-awesome-pages-plugin",
+    "mkdocstrings[python]",
+    "markdown-include",
+]
 
 [console_scripts]
 earth_osm = "earth_osm.__main__:main"
diff --git a/requirements-docs.txt b/requirements-docs.txt
deleted file mode 100644
index fe1d957..0000000
--- a/requirements-docs.txt
+++ /dev/null
@@ -1,6 +0,0 @@
-lazydocs
-mkdocs
-mkdocs-material
-mkdocs-awesome-pages-plugin
-mkdocstrings[python]
-markdown-include
\ No newline at end of file
diff --git a/requirements-test.txt b/requirements-test.txt
deleted file mode 100644
index 881b399..0000000
--- a/requirements-test.txt
+++ /dev/null
@@ -1,12 +0,0 @@
-pytest
-coverage
-flake8
-black
-isort
-pytest-cov
-codecov
-mypy>=0.9
-gitchangelog
-mkdocs
-pprint
-osmium
\ No newline at end of file
diff --git a/requirements.txt b/requirements.txt
deleted file mode 100644
index 3825b78..0000000
--- a/requirements.txt
+++ /dev/null
@@ -1,5 +0,0 @@
-geopandas
-pandas
-tqdm
-requests
-protobuf>=4.21.1
\ No newline at end of file