diff --git a/pyproject.toml b/pyproject.toml
index 1d41e5d..a491fb9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -46,7 +46,7 @@ dev = [
 ]
 docs = [
     "mkdocstrings[python]~=1.0.2",
-    "zensical==0.0.20",
+    "zensical==0.0.21",
 ]
 lint = [
     "ruff>=0.12.9",