diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index 0fde9557..ce2785b7 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -15,7 +15,25 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.9', '3.12']
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        exclude:
+          # only test 3.13 for MacOS and Windows
+          - os: macos-latest
+            python-version: '3.9'
+          - os: macos-latest
+            python-version: '3.10'
+          - os: macos-latest
+            python-version: '3.11'
+          - os: macos-latest
+            python-version: '3.12'
+          - os: windows-latest
+            python-version: '3.9'
+          - os: windows-latest
+            python-version: '3.10'
+          - os: windows-latest
+            python-version: '3.11'
+          - os: windows-latest
+            python-version: '3.12'
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
diff --git a/pyproject.toml b/pyproject.toml
index 7acaea24..aaa03bb5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,6 +26,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: File Formats",
     "Topic :: Scientific/Engineering :: Physics",
     "Topic :: Scientific/Engineering :: Chemistry",