diff --git a/requirements.txt b/requirements.txt
index fe784af..39d5e3c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 # Build toolchain for the documentation site.
 # Pinned to an exact version for reproducible CI builds; Dependabot proposes
 # updates deliberately (see .github/dependabot.yml).
-zensical==0.0.50
+zensical==0.0.51