diff --git a/.github/milestones.py b/.github/milestones.py
new file mode 100755
index 0000000..5e868dc
--- /dev/null
+++ b/.github/milestones.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python
+
+# stdlib
+import os
+import sys
+
+# 3rd party
+from github3 import GitHub
+from github3.repos import Repository
+from packaging.version import InvalidVersion, Version
+
+latest_tag = os.environ["GITHUB_REF_NAME"]
+
+try:
+	current_version = Version(latest_tag)
+except InvalidVersion:
+	sys.exit()
+
+gh: GitHub = GitHub(token=os.environ["GITHUB_TOKEN"])
+repo: Repository = gh.repository(*os.environ["GITHUB_REPOSITORY"].split('/', 1))
+
+for milestone in repo.milestones(state="open"):
+	try:
+		milestone_version = Version(milestone.title)
+	except InvalidVersion:
+		continue
+	if milestone_version == current_version:
+		sys.exit(not milestone.update(state="closed"))
diff --git a/.github/workflows/python_ci.yml b/.github/workflows/python_ci.yml
index 94bd7c5..2121d84 100644
--- a/.github/workflows/python_ci.yml
+++ b/.github/workflows/python_ci.yml
@@ -13,6 +13,7 @@ on:
 
 permissions:
   actions: write
+  issues: write
   contents: read
 
 jobs:
@@ -21,7 +22,7 @@ jobs:
     runs-on: "windows-2019"
     continue-on-error: ${{ matrix.config.experimental }}
     env:
-      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.3'
+      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.5'
 
     strategy:
       fail-fast: False
@@ -32,7 +33,7 @@ jobs:
           - {python-version: "3.8", testenvs: "py38,build", experimental: False}
           - {python-version: "3.9", testenvs: "py39,build", experimental: False}
           - {python-version: "3.10", testenvs: "py310,build", experimental: False}
-          - {python-version: "3.11.0-alpha.3", testenvs: "py311-dev,build", experimental: True}
+          - {python-version: "3.11.0-alpha.5", testenvs: "py311-dev,build", experimental: True}
 
     steps:
       - name: Checkout 🛎️
diff --git a/.github/workflows/python_ci_linux.yml b/.github/workflows/python_ci_linux.yml
index ea1fe02..14cbdbf 100644
--- a/.github/workflows/python_ci_linux.yml
+++ b/.github/workflows/python_ci_linux.yml
@@ -14,6 +14,7 @@ on:
 
 permissions:
   actions: write
+  issues: write
   contents: read
 
 jobs:
@@ -22,7 +23,7 @@ jobs:
     runs-on: "ubuntu-20.04"
     continue-on-error: ${{ matrix.config.experimental }}
     env:
-      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.3'
+      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.5'
 
     strategy:
       fail-fast: False
@@ -33,7 +34,7 @@ jobs:
           - {python-version: "3.8", testenvs: "py38,build", experimental: False}
           - {python-version: "3.9", testenvs: "py39,build", experimental: False}
           - {python-version: "3.10", testenvs: "py310,build", experimental: False}
-          - {python-version: "3.11.0-alpha.3", testenvs: "py311-dev,build", experimental: True}
+          - {python-version: "3.11.0-alpha.5", testenvs: "py311-dev,build", experimental: True}
 
     steps:
       - name: Checkout 🛎️
@@ -136,21 +137,21 @@ jobs:
 
       - name: Setup Python 🐍
         uses: "actions/setup-python@v2"
+        if: startsWith(github.ref, 'refs/tags/')
         with:
           python-version: 3.8
-        if: startsWith(github.ref, 'refs/tags/')
 
       - name: Install dependencies 🔧
+        if: startsWith(github.ref, 'refs/tags/')
         run: |
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install --upgrade tox
-        if: startsWith(github.ref, 'refs/tags/')
 
       - name: Build distributions 📦
+        if: startsWith(github.ref, 'refs/tags/')
         run: |
           tox -e build
 
-        if: startsWith(github.ref, 'refs/tags/')
 
       - name: Upload distribution to PyPI 🚀
         if: startsWith(github.ref, 'refs/tags/')
@@ -159,3 +160,11 @@ jobs:
           user: __token__
           password: ${{ secrets.PYPI_TOKEN }}
           skip_existing: true
+
+      - name: Close milestone 🚪
+        if: startsWith(github.ref, 'refs/tags/')
+        run: |
+          python -m pip install --upgrade github3.py packaging
+          python .github/milestones.py
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/python_ci_macos.yml b/.github/workflows/python_ci_macos.yml
index 00adfa6..19bfb9c 100644
--- a/.github/workflows/python_ci_macos.yml
+++ b/.github/workflows/python_ci_macos.yml
@@ -13,6 +13,7 @@ on:
 
 permissions:
   actions: write
+  issues: write
   contents: read
 
 jobs:
@@ -21,7 +22,7 @@ jobs:
     runs-on: "macos-latest"
     continue-on-error: ${{ matrix.config.experimental }}
     env:
-      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.3'
+      USING_COVERAGE: '3.6,3.7,3.8,3.9,3.10,3.11.0-alpha.5'
 
     strategy:
       fail-fast: False
@@ -32,7 +33,7 @@ jobs:
           - {python-version: "3.8", testenvs: "py38,build", experimental: False}
           - {python-version: "3.9", testenvs: "py39,build", experimental: False}
           - {python-version: "3.10", testenvs: "py310,build", experimental: False}
-          - {python-version: "3.11.0-alpha.3", testenvs: "py311-dev,build", experimental: True}
+          - {python-version: "3.11.0-alpha.5", testenvs: "py311-dev,build", experimental: True}
 
     steps:
       - name: Checkout 🛎️
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d407452..7107981 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -67,7 +67,7 @@ repos:
        - --keep-runtime-typing
 
  - repo: https://github.com/Lucas-C/pre-commit-hooks
-   rev: v1.1.10
+   rev: v1.1.11
    hooks:
     - id: remove-crlf
     - id: forbid-crlf
diff --git a/tox.ini b/tox.ini
index 547f11b..b2aa464 100644
--- a/tox.ini
+++ b/tox.ini
@@ -19,9 +19,8 @@ envlist = py36, py37, py38, py39, py310, py311-dev, mypy, build
 skip_missing_interpreters = True
 isolated_build = True
 requires =
-    pip>=20.3.3
+    pip>=21
     tox-envlist>=0.2.1
-    tox-pip-version>=0.0.7
 
 [envlists]
 test = py36, py37, py38, py39, py310, py311-dev