diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 30a057a..6ec246e 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -22,6 +22,7 @@ jobs:
         os:
           - Ubuntu
         py:
+          - 3.10.0-rc.2
           - 3.9
           - 3.8
           - 3.7
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index f06055a..c7822ff 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,7 +18,7 @@ repos:
     hooks:
       - id: isort
   - repo: https://github.com/psf/black
-    rev: 21.8b0
+    rev: 21.9b0
     hooks:
       - id: black
         args: [--safe]
@@ -27,7 +27,7 @@ repos:
     rev: v1.17.0
     hooks:
       - id: setup-cfg-fmt
-        args: ["--max-py-version", "3.9"]
+        args: ["--max-py-version", "3.10"]
   - repo: https://github.com/tox-dev/tox-ini-fmt
     rev: "0.5.1"
     hooks:
diff --git a/setup.cfg b/setup.cfg
index 044921a..3547645 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -24,6 +24,7 @@ classifiers =
     Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
+    Programming Language :: Python :: 3.10
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Documentation
     Topic :: Documentation :: Sphinx
diff --git a/tox.ini b/tox.ini
index 2a2bfa6..6086ddc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,6 @@
 [tox]
 envlist =
+    py310
     py39
     py38
     py37
diff --git a/whitelist.txt b/whitelist.txt
index 046245e..bef381f 100644
--- a/whitelist.txt
+++ b/whitelist.txt
@@ -2,15 +2,14 @@ addinivalue
 anonlabels
 autosectionlabel
 buildername
-confdir
 cmd
+confdir
 desc
 dest
 doc2path
 docname
 docutils
 formatter
-Formatter
 fromlist
 grp
 lineno
@@ -24,9 +23,9 @@ prog
 refid
 reftitle
 rst
+setdefault
 statemachine
 subparsers
 subtype
 testroot
 util
-setdefault