diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 8d7dd2d1e886..d95e3d349204 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -46,6 +46,7 @@ python -m venv venv
 
 ```bash
 python -m pip install -r test-requirements.txt
+python -m pip install --group dev
 python -m pip install -e .
 hash -r  # This resets shell PATH cache, not necessary on Windows
 ```
diff --git a/pyproject.toml b/pyproject.toml
index 0de739be9b55..05084bfa6fae 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,6 +66,13 @@ reports = ["lxml"]
 install-types = ["pip"]
 faster-cache = ["orjson"]
 
+[dependency-groups]
+dev = [
+  # Not strictly needed for building per se, but pip-compile from this package is needed if you want to update the requirement files. (Word on the street is you can also use uv pip compile instead.):
+  "pip-tools>=7.5.1",
+  "pip<25.3", # workaround for this problem until its fix gets released: https://github.com/jazzband/pip-tools/pull/2253
+]
+
 [project.urls]
 Homepage = "https://www.mypy-lang.org/"
 Documentation = "https://mypy.readthedocs.io/en/stable/index.html"