diff --git a/tox.ini b/tox.ini
index f7b11634a..9616d3c95 100644
--- a/tox.ini
+++ b/tox.ini
@@ -51,9 +51,7 @@ allowlist_externals =
 
 [testenv:docs]
 skipsdist = true
-deps =
-  sphinx
-  sphinx_rtd_theme
+deps = -rdocs/requirements.txt
 commands =
   bash {toxinidir}/tests/build-docs