diff --git a/doc-source/rtd-extra-deps.txt b/doc-source/rtd-extra-deps.txt
index 57ca99c..cee1be9 100644
--- a/doc-source/rtd-extra-deps.txt
+++ b/doc-source/rtd-extra-deps.txt
@@ -1,2 +1,2 @@
 .
-sphinx<3.4.0,>=3.0.3
+sphinx>=3.0.3