diff --git a/Documentation/sphinx/requirements.txt b/Documentation/sphinx/requirements.txt
index 335b53df35e22faadd2443bc849de5afd2100601..6b0a981dcb2cdd208ff86a0b0fd6f6cb4422f9fa 100644
--- a/Documentation/sphinx/requirements.txt
+++ b/Documentation/sphinx/requirements.txt
@@ -1,3 +1,5 @@
 # jinja2>=3.1 is not compatible with Sphinx<4.0
 jinja2<3.1
+# alabaster>=0.7.14 is not compatible with Sphinx<=3.3
+alabaster<0.7.14
 Sphinx==2.4.4