diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index bd3d481..8af47fe 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,7 +21,13 @@ jobs:
           - "3.11"
           - "3.12"
           - "3.13"
-    runs-on: ubuntu-latest
+        platform-version:
+          - "ubuntu-24.04"
+        include:
+          # Python 3.7 only runs on Ubuntu 22.04
+          - python-version: "3.7"
+            platform-version: "ubuntu-22.04"
+    runs-on: ${{ matrix.platform-version }}
     steps:
       - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       - name: Set up Python ${{ matrix.python-version }}
diff --git a/morgan/__init__.py b/morgan/__init__.py
index 8e46e6a..50e6bcb 100644
--- a/morgan/__init__.py
+++ b/morgan/__init__.py
@@ -293,7 +293,8 @@ def _filter_files(
         return files
 
     def _matches_environments(self, fileinfo: dict) -> bool:
-        if req := fileinfo.get("requires-python"):
+        req = fileinfo.get("requires-python")
+        if req:
             # The Python versions in all of our environments must be supported
             # by this file in order to match.
             # Some packages specify their required Python versions with a simple
diff --git a/pyproject.toml b/pyproject.toml
index 7efcd27..533023e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,11 +14,8 @@ keywords = [ "pypi", "mirror", "packages", "pypi-mirror" ]
 readme = "README.md"
 requires-python = ">=3.7"
 dependencies = [
-    #"packaging~=21.3",
-        # hatchling 1.27.0 requires packaging>=24.2, but you have packaging 21.3 which is incompatible.
-    "packaging~=24.2",
-        # packaging.utils.InvalidSdistFilename: Invalid sdist filename (invalid version): 'expandvars-0.6.0-macosx-10.15-x86_64.tar.gz' (old versions)
-        # solved in morgan/__init__.py
+    "packaging~=24.0; python_version == '3.7'",
+    "packaging~=24.2; python_version >= '3.8'",
     "importlib-metadata~=4.12.0; python_version < '3.8'",
     "tomli~=2.0.1",
     "python-dateutil",
@@ -36,6 +33,9 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "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",
     "Topic :: Internet :: WWW/HTTP :: HTTP Servers",
 ]