diff --git a/Makefile b/Makefile
index 42c2431..2ab8435 100644
--- a/Makefile
+++ b/Makefile
@@ -49,8 +49,8 @@ release-deb:
 
 install-dev:
 	pip install -U pip setuptools wheel
-	pip install -e .
-	pip install -Ur test-requirements.txt -r docs-requirements.txt pre-commit
+	pip install -e '.[test]'
+	pip install -U -r docs-requirements.txt pre-commit
 	set -xe && if [ "$(REQUIREMENTS)" = "minimal" ]; then \
 		pip install pyproject-dependencies && \
 		pip install -U --force-reinstall $$(pyproject-dependencies . | sed 's/>/=/'); \
diff --git a/docs/packaging.rst b/docs/packaging.rst
index 66bcd3b..301d505 100644
--- a/docs/packaging.rst
+++ b/docs/packaging.rst
@@ -46,8 +46,9 @@ You can install the all development dependencies with::
     make install-dev
 
 You probably don't want this since it will use pip to download the
-dependencies. Alternatively you can find the testing dependencies in
-``test-requirements.txt``, again with lower-bound version requirements.
+dependencies. Alternatively test dependencies are listed as ``test`` optional
+dependencies in ``pyproject.toml``, again with lower-bound version
+requirements.
 
 You also have to have vdirsyncer fully installed at this point. Merely
 ``cd``-ing into the tarball will not be sufficient.
diff --git a/pyproject.toml b/pyproject.toml
index b8b473a..6d7a0ea 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,15 @@ dynamic = ["version"]
 
 [project.optional-dependencies]
 google = ["aiohttp-oauthlib"]
+test = [
+  "hypothesis>=6.72.0,<7.0.0",
+  "pytest",
+  "pytest-cov",
+  "pytest-httpserver",
+  "trustme",
+  "pytest-asyncio",
+  "aioresponses",
+]
 
 [project.scripts]
 vdirsyncer = "vdirsyncer.cli:app"
diff --git a/test-requirements.txt b/test-requirements.txt
deleted file mode 100644
index be40a37..0000000
--- a/test-requirements.txt
+++ /dev/null
@@ -1,7 +0,0 @@
-hypothesis>=6.72.0,<7.0.0
-pytest
-pytest-cov
-pytest-httpserver
-trustme
-pytest-asyncio
-aioresponses