diff --git a/readthedocs/requirements.txt b/readthedocs/requirements.txt
index 018445c16..9342a8a47 100644
--- a/readthedocs/requirements.txt
+++ b/readthedocs/requirements.txt
@@ -1,6 +1,6 @@
-sphinx==6
+sphinx
 sphinx_mdinclude
 numpy
 scipy
-docutils>=0.18
-sphinx_rtd_theme==1.2.0rc3
+docutils
+sphinx_rtd_theme