diff --git a/requirements-docs.txt b/requirements-docs.txt
index 0fb2a86..dd78827 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -2,4 +2,4 @@
 #
 # Pinned so that local builds and CI produce the same output. Bump
 # deliberately, in its own commit, after checking the rendered site.
-zensical==0.0.62
+zensical==0.0.66