diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4be1bd2..4b1c377 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,14 +19,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
 
@@ -36,12 +36,11 @@ jobs:
         run: |
           python --version
           pip install codecov pytest-cov
-          pip install -U pytest docutils pygments Cython matplotlib
-          pip install -e .
+          pip install -e '.[test]'
           pip freeze
 
       - name: Tests
         run: |
           pytest --cov=eventio --cov-report=xml
 
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
diff --git a/pyproject.toml b/pyproject.toml
index 636b562..e86eb4e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,7 +6,7 @@ build-backend = "setuptools.build_meta"
 name = "eventio"
 description = "Python read-only implementation of the EventIO file format"
 
-requires-python = '>=3.9'
+requires-python = '>=3.10'
 dependencies = [
     'numpy >= 1.21',
     'corsikaio >= 0.3.3,<0.6.0',
@@ -29,10 +29,10 @@ classifiers = [
 	"Operating System :: OS Independent",
 	"Programming Language :: Python",
 	"Programming Language :: Python :: 3",
-	"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 :: 3 :: Only",
 	"Topic :: Scientific/Engineering :: Astronomy",
 	"Topic :: Scientific/Engineering :: Physics",