diff --git a/setup.py b/setup.py
index e60ab1a2150c34aecdd1b13eab2ac9d75839ba66_c2V0dXAucHk=..595bfb54d4c71f2a9545009091df97b9e1bc5f91_c2V0dXAucHk= 100644
--- a/setup.py
+++ b/setup.py
@@ -252,7 +252,7 @@
             "doc8",
             "pyenchant >= 1.6.11",
             "twine >= 1.12.0",
-            "sphinxcontrib-spelling >= 4.0.1,!=5.1.2",
+            "sphinxcontrib-spelling >= 4.0.1",
         ],
         "pep8test": [
             "flake8",
diff --git a/tox.ini b/tox.ini
index e60ab1a2150c34aecdd1b13eab2ac9d75839ba66_dG94LmluaQ==..595bfb54d4c71f2a9545009091df97b9e1bc5f91_dG94LmluaQ== 100644
--- a/tox.ini
+++ b/tox.ini
@@ -45,10 +45,10 @@
     docstest
 basepython = python3
 commands =
-    sphinx-build -j4 -T -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
-    sphinx-build -j4 -T -W -b latex -d {envtmpdir}/doctrees docs docs/_build/latex
-    sphinx-build -j4 -T -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html
-    sphinx-build -j4 -T -W -b spelling docs docs/_build/html
+    sphinx-build -T -W -b html -d {envtmpdir}/doctrees docs docs/_build/html
+    sphinx-build -T -W -b latex -d {envtmpdir}/doctrees docs docs/_build/latex
+    sphinx-build -T -W -b doctest -d {envtmpdir}/doctrees docs docs/_build/html
+    sphinx-build -T -W -b spelling docs docs/_build/html
     doc8 --allow-long-titles README.rst CHANGELOG.rst docs/ --ignore-path docs/_build/
     python setup.py sdist
     twine check dist/*