diff --git a/docs/requirements.txt b/docs/requirements.txt
index 9f5d80a334..f801005fd3 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -4,6 +4,7 @@ sphinx==3.2.1
 myst-parser==0.15.2
 myst-parser[linkify]==0.15.2
 Jinja2 < 3.1
+alabaster==0.7.13
 
 # sphinx-multiversion with evennia fixes 
 git+https://github.com/evennia/sphinx-multiversion.git@evennia-mods#egg=sphinx-multiversion