diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index edcd4fff..28224ef5 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -14,11 +14,11 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python: [3.8, 3.9, '3.10', 3.11]
+        python: [3.9, '3.10', '3.11', '3.12', '3.13']
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python }}
       - name: Install Tox
@@ -32,9 +32,9 @@ jobs:
       matrix:
         linter: [flake8, black, license]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v5
         with:
           python-version: 3.11
       - name: Install Tox
diff --git a/setup.py b/setup.py
index 9b1fde59..767b23e9 100644
--- a/setup.py
+++ b/setup.py
@@ -34,12 +34,12 @@ def load_readme():
     license="Apache Software License",
     packages=find_packages(),
     setup_requires=["setuptools_scm"],
-    python_requires=">=3.8",
+    python_requires=">=3.9",
     install_requires=[
         "requests",
         "pytz",
         "attrs",
-        "marshmallow",
+        "marshmallow<4",  # TODO: remove this limit once the code is migrated
         "marshmallow_enum",
         "urllib3",
     ],