diff --git a/docs/requirements.txt b/docs/requirements.txt
index 6c5d5d44e78ada9ae8ccbf17ec4f3bc72779ced0..f85be1ffb642487417f258506d24af7ea93b7725 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1 +1 @@
-sphinx-rtd-theme
+sphinx-rtd-theme==0.5.2