diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c80c94c..2199bdb 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,7 +27,8 @@ jobs:
           - "3.10"
           - "3.11"
           - "3.12"
-          - "pypy-3.7"
+          - "3.13"
+          - "pypy3.10"
         vcs:
           - bzr
           - git
diff --git a/CHANGES.rst b/CHANGES.rst
index 50ae609..31e05dd 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@ Changelog
 0.50 (unreleased)
 -----------------
 
-- Add Python 3.12 support.
+- Add Python 3.12 and 3.13 support.
 
 
 0.49 (2022-12-05)
diff --git a/Makefile b/Makefile
index 9dd488d..a0862f0 100755
--- a/Makefile
+++ b/Makefile
@@ -42,6 +42,54 @@ isort:                          ##: check for incorrect import ordering
 mypy:                           ##: check for type errors
 	tox -e mypy
 
+##: GitHub maintenance
+
+.PHONY: update-github-branch-protection-rules
+
+update-github-branch-protection-rules:  ##: update GitHub branch protection rules
+	gh api -X PUT -H "Accept: application/vnd.github+json" \
+		-H "X-GitHub-Api-Version: 2022-11-28" \
+		/repos/mgedmin/check-manifest/branches/master/protection/required_status_checks/contexts \
+		-f "contexts[]=check-manifest"                         \
+		-f "contexts[]=check-python-versions"                  \
+		-f "contexts[]=flake8"                                 \
+		-f "contexts[]=isort"                                  \
+		-f "contexts[]=mypy"                                   \
+		-f "contexts[]=Python 3.7, bzr"                        \
+		-f "contexts[]=Python 3.7, git"                        \
+		-f "contexts[]=Python 3.7, hg"                         \
+		-f "contexts[]=Python 3.7, svn"                        \
+		-f "contexts[]=Python 3.8, bzr"                        \
+		-f "contexts[]=Python 3.8, git"                        \
+		-f "contexts[]=Python 3.8, hg"                         \
+		-f "contexts[]=Python 3.8, svn"                        \
+		-f "contexts[]=Python 3.9, bzr"                        \
+		-f "contexts[]=Python 3.9, git"                        \
+		-f "contexts[]=Python 3.9, hg"                         \
+		-f "contexts[]=Python 3.9, svn"                        \
+		-f "contexts[]=Python 3.10, bzr"                       \
+		-f "contexts[]=Python 3.10, git"                       \
+		-f "contexts[]=Python 3.10, hg"                        \
+		-f "contexts[]=Python 3.10, svn"                       \
+		-f "contexts[]=Python 3.11, bzr"                       \
+		-f "contexts[]=Python 3.11, git"                       \
+		-f "contexts[]=Python 3.11, hg"                        \
+		-f "contexts[]=Python 3.11, svn"                       \
+		-f "contexts[]=Python 3.12, bzr"                       \
+		-f "contexts[]=Python 3.12, git"                       \
+		-f "contexts[]=Python 3.12, hg"                        \
+		-f "contexts[]=Python 3.12, svn"                       \
+		-f "contexts[]=Python 3.13, bzr"                       \
+		-f "contexts[]=Python 3.13, git"                       \
+		-f "contexts[]=Python 3.13, hg"                        \
+		-f "contexts[]=Python 3.13, svn"                       \
+		-f "contexts[]=Python pypy3.10, bzr"                   \
+		-f "contexts[]=Python pypy3.10, git"                   \
+		-f "contexts[]=Python pypy3.10, hg"                    \
+		-f "contexts[]=Python pypy3.10, svn"                   \
+		-f "contexts[]=continuous-integration/appveyor/branch" \
+		-f "contexts[]=continuous-integration/appveyor/pr"
+
 ##: Releasing
 
 .PHONY: distcheck
diff --git a/appveyor.yml b/appveyor.yml
index 3ac23e8..a86dee3 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,6 +10,7 @@ environment:
     - PYTHON: "C:\\Python310"
     - PYTHON: "C:\\Python311"
     - PYTHON: "C:\\Python312"
+    - PYTHON: "C:\\Python313"
 
 init:
   - "echo %PYTHON%"
diff --git a/setup.py b/setup.py
index 9dd35b4..33f3402 100755
--- a/setup.py
+++ b/setup.py
@@ -50,6 +50,7 @@
         'Programming Language :: Python :: 3.10',
         'Programming Language :: Python :: 3.11',
         'Programming Language :: Python :: 3.12',
+        'Programming Language :: Python :: 3.13',
         'Programming Language :: Python :: Implementation :: CPython',
         'Programming Language :: Python :: Implementation :: PyPy',
     ],
diff --git a/tox.ini b/tox.ini
index a94ace2..b5ba500 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py37,py38,py39,py310,py311,py312,pypy3,flake8
+    py37,py38,py39,py310,py311,py312,py313,pypy3,flake8
 
 [testenv]
 passenv =