diff --git a/docs/requirements.txt b/docs/requirements.txt
index 8ca176c..4e35c4e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,7 +1,7 @@
 ipython
-nbsphinx==0.8.6
-readthedocs-sphinx-search==0.1.0
-sphinx==4.0.3
+nbsphinx
+readthedocs-sphinx-search
+sphinx
 sphinx-gallery
-sphinx_rtd_theme==0.5.2
+sphinx_rtd_theme
 mock