diff --git a/pyproject.toml b/pyproject.toml
index 4af0e1f..56c7faf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,7 +50,7 @@ brep = ["build123d"]
 scipp = ["scipp"]
 docs = [
     # Zensical is pre-1.0 and ships weekly; pin exactly and bump deliberately.
-    "zensical==0.0.59",
+    "zensical==0.0.67",
     "mkdocstrings-python>=2.0",
     # Renders the example notebooks to Markdown; see docs/examples/build.py
     "nbconvert>=7.0",