diff --git a/docs/requirements.txt b/docs/requirements.txt
index b42df688d..a1aef4cb2 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -14,8 +14,7 @@ optax
 pillow
 pylab-sdk
 pyyaml
-readthedocs-sphinx-search==0.1.2
-sphinx<5
+sphinx>=5
 sphinx-gallery==0.10.1  # tutorial page is not rendered correctly with newer versions
 sphinx_rtd_theme==1.0.0
 tensorflow_probability
diff --git a/setup.py b/setup.py
index e6b13e248..59e4a3258 100644
--- a/setup.py
+++ b/setup.py
@@ -44,7 +44,7 @@
             "ipython",  # sphinx needs this to render codes
             "nbsphinx>=0.8.5",
             "readthedocs-sphinx-search==0.1.0",
-            "sphinx",
+            "sphinx>=5",
             "sphinx_rtd_theme",
             "sphinx-gallery",
         ],