diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 449fb31..ef403f3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -27,10 +27,10 @@ jobs:
           python-version: "3.12"
 
       - name: Check format
-        run: uvx ruff format --check .
+        run: uvx ruff@0.15.12 format --check .
 
       - name: Lint
-        run: uvx ruff check .
+        run: uvx ruff@0.15.12 check .
 
   types:
     runs-on: ubuntu-latest
diff --git a/pyproject.toml b/pyproject.toml
index 2c0328b..95722f6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -56,6 +56,11 @@ output-format = "concise"
 line-length = 88
 extend-exclude = []
 
+[tool.ruff.format]
+# ruff >= 0.16 formats Python code blocks inside Markdown by default and
+# inserts PEP 8 blank lines in every doc snippet. Docs stay hand-formatted.
+exclude = ["*.md"]
+
 [tool.ruff.lint]
 select = [
     "F", # Pyflakes