diff --git a/.github/workflows/pytest.yaml b/.github/workflows/pytest.yaml
index eec2410..996bba6 100644
--- a/.github/workflows/pytest.yaml
+++ b/.github/workflows/pytest.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.12", "3.11", "3.10", "3.9"]
+        python-version: ["3.13", "3.12", "3.11", "3.10", "3.9"]
         os: [ubuntu-latest, windows-latest, macOS-latest]
       fail-fast: false
     defaults:
diff --git a/.github/workflows/shiny.yaml b/.github/workflows/shiny.yaml
index eb2f016..a2d5231 100644
--- a/.github/workflows/shiny.yaml
+++ b/.github/workflows/shiny.yaml
@@ -22,7 +22,7 @@ jobs:
       - name: Setup py-shiny@main
         uses: posit-dev/py-shiny/.github/py-shiny/setup@main
         with:
-          python-version: "3.12"
+          python-version: "3.13"
 
       - name: Checkout dev branch of py-htmltools
         uses: actions/checkout@v4
diff --git a/htmltools/__init__.py b/htmltools/__init__.py
index cfe1bb6..0dcc8f0 100644
--- a/htmltools/__init__.py
+++ b/htmltools/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "0.5.3.9002"
+__version__ = "0.5.3.9003"
 
 from . import svg, tags
 from ._core import TagAttrArg  # pyright: ignore[reportUnusedImport] # noqa: F401
diff --git a/pyproject.toml b/pyproject.toml
index 3d3a42b..17ab22f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
   "Topic :: Software Development :: Libraries :: Python Modules",