diff --git a/doc/requirements.txt b/doc/requirements.txt
index 2b1aab7..d7c4c57 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,4 @@
 sphinx == 7.0.1
 numpy >= 1.13.3
+sphinx-rtd-theme == 1.2.2
 numpydoc == 1.5.0
-numexpr
-