diff --git a/docs/requirements.txt b/docs/requirements.txt
index c7d3f66..78142cc 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
-docutils>=0.14,<0.21
+docutils>=0.14,<0.22
 ipykernel
 ipython
 jinja2>=3.0
diff --git a/requirements.txt b/requirements.txt
index 33e5b8f..c0293a6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,6 @@
 anaconda-client
 conda-build
-docutils>=0.14,<0.21
+docutils>=0.14,<0.22
 ipykernel
 ipython
 jinja2>=3.0
diff --git a/setup.py b/setup.py
index aed6696..15fefdf 100644
--- a/setup.py
+++ b/setup.py
@@ -38,12 +38,12 @@ def get_version():
               'thermodynamics'],
     install_requires=['matplotlib', 'numpy', 'scipy'],
     extras_require={
-      'docs': ['docutils>=0.14,<0.21', 'ipykernel', 'ipython',
+      'docs': ['docutils>=0.14,<0.22', 'ipykernel', 'ipython',
                'jinja2>=3.0', 'nbsphinx', 'pycodestyle',
                'sphinx', 'sphinx-copybutton',
                'sphinx-rtd-theme', 'sphinxcontrib-bibtex'],
       'testing': ['pycodestyle', 'pylint', 'pytest', 'pytest-cov'],
-      'all': ['docutils>=0.14,<0.21', 'ipykernel', 'ipython', 'jinja2>=3.0',
+      'all': ['docutils>=0.14,<0.22', 'ipykernel', 'ipython', 'jinja2>=3.0',
               'nbsphinx', 'pycodestyle', 'pylint', 'pytest', 'pytest-cov',
               'sphinx', 'sphinx-copybutton',
               'sphinx-rtd-theme', 'sphinxcontrib-bibtex']