diff --git a/setup.py b/setup.py
index c96f1fe24..e55a48e17 100755
--- a/setup.py
+++ b/setup.py
@@ -132,7 +132,7 @@ setup(
         ],
         "docs": [
             "sphinx",
-            "sphinx_rtd_theme",
+            "pydata_sphinx_theme",
         ],
         # Plugin (optional) dependencies:
         "absubmit": ["requests"],
diff --git a/tox.ini b/tox.ini
index 4fa8d897c..fb0027177 100644
--- a/tox.ini
+++ b/tox.ini
@@ -33,7 +33,9 @@ commands =
 
 [testenv:docs]
 basepython = python3.10
-deps = sphinx<4.4.0
+deps =
+    sphinx<4.4.0
+    pydata_sphinx_theme
 commands = sphinx-build -W -q -b html docs {envtmpdir}/html {posargs}
 
 # checks all links in the docs