diff --git a/pyproject.toml b/pyproject.toml
index b6c742df..548388e8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -107,6 +107,9 @@ universal = true
 # Code to match this is in ``conf.py``.
 version_scheme = "post-release"
 
+[tool.uv.sources]
+docformatter = { git = "https://github.com/finswimmer/docformatter.git", rev = "948c28a5d43106bad3ec796fdf26f87cbdaee085" }
+
 [tool.ruff]
 line-length = 79
 
@@ -273,6 +276,7 @@ spelling-store-unknown-words = 'no'
 
 [tool.docformatter]
 make-summary-multi-line = true
+style = "black"
 
 [tool.check-manifest]