diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 74ade9d..4885702 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,7 +24,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.6, 3.7, 3.8, 3.9.0-rc.1]
+        python-version: [3.7, 3.8, 3.9, '3.10']
         os: [ubuntu-latest, windows-latest]
 
     steps:
diff --git a/mdformat_footnote/plugin.py b/mdformat_footnote/plugin.py
index a84e774..98088de 100644
--- a/mdformat_footnote/plugin.py
+++ b/mdformat_footnote/plugin.py
@@ -1,5 +1,7 @@
+from __future__ import annotations
+
+from collections.abc import Mapping
 import textwrap
-from typing import Mapping
 
 from markdown_it import MarkdownIt
 from mdformat.renderer import RenderContext, RenderTreeNode
diff --git a/pyproject.toml b/pyproject.toml
index 10f76df..84d7698 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,7 +18,7 @@ classifiers = [
 ]
 keywords = "mdformat,markdown,markdown-it"
 
-requires-python=">=3.6"
+requires-python=">=3.7"
 requires=["mdformat >=0.7.8,<0.8.0",
           "mdit-py-plugins",
             ]
diff --git a/tox.ini b/tox.ini
index da12282..46434e8 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,20 +1,20 @@
 [tox]
-envlist = py{36,37,38,39}
+envlist = py{37,38,39,310}
 isolated_build = True
 
-[testenv:py{36,37,38,39}]
+[testenv:py{37,38,39,310}]
 extras = test
 commands = pytest {posargs}
 
-[testenv:py{36,37,38,39}-cov]
+[testenv:py{37,38,39,310}-cov]
 extras = test
 commands = pytest --cov={envsitepackagesdir}/mdformat_footnote {posargs}
 
-[testenv:py{36,37,38,39}-pre-commit]
+[testenv:py{37,38,39,310}-pre-commit]
 extras = dev
 commands = pre-commit run {posargs}
 
-[testenv:py{36,37,38,39}-hook]
+[testenv:py{37,38,39,310}-hook]
 extras = dev
 commands = pre-commit run --config .pre-commit-test.yaml {posargs:--all-files --verbose --show-diff-on-failure}