diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c3406a9..9df2f28 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@42375524e23c412d93fb67b49958b491fce71c38 # v5.4.0
         with:
-          python-version: "3.9"
+          python-version: "3.13"
 
       - id: cache
         uses: actions/cache@d4323d4df104b026a6aa633fdb11d772146be0bf # v4.2.2
diff --git a/publish.py b/publish.py
index aee86f4..cc3ddac 100644
--- a/publish.py
+++ b/publish.py
@@ -57,9 +57,11 @@ async def upload_with_twine(
     }
 
     python_path = os.path.join(virtualenv_dir, "bin", "python")
+    pip_path = os.path.join(virtualenv_dir, "bin", "pip")
     twine_path = os.path.join(virtualenv_dir, "bin", "twine")
 
     # Create source distribution and wheel.
+    await call([pip_path, "install", "setuptools"], env=environ, cwd=project_dir)
     await call([python_path, "setup.py", "sdist"], env=environ, cwd=project_dir)
     await call([python_path, "setup.py", "bdist_wheel"], env=environ, cwd=project_dir)
     dist_files = os.listdir(os.path.join(project_dir, "dist"))
diff --git a/release.py b/release.py
index a311e8f..6c47ea0 100644
--- a/release.py
+++ b/release.py
@@ -4,7 +4,7 @@
 import os
 from subprocess import CalledProcessError
 
-from pkg_resources import parse_version
+from packaging.version import parse
 
 from async_subprocess import (
     call,
@@ -235,7 +235,7 @@ async def release(
             working_dir=working_dir,
             readonly=False,
         )
-        if parse_version(old_version) >= parse_version(new_version):
+        if parse(old_version) >= parse(new_version):
             raise ReleaseException(
                 f"old version is {old_version} but the new version {new_version} is not newer"
             )
diff --git a/requirements.txt b/requirements.txt
index 15f9f74..414cc24 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ requests
 sentry-sdk
 tornado
 virtualenv
+packaging