diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 5a8b4e0f1..8fd18470f 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -17,11 +17,11 @@ jobs:
       fail-fast: false
       matrix:
         python:
+          - '3.13'
           - '3.12'
           - '3.11'
           - '3.10'
           - '3.9'
-          - '3.8'
           - 'pypy-3.10'
     steps:
       - uses: actions/checkout@v2
@@ -40,7 +40,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
@@ -57,7 +57,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-python@v2
         with:
-          python-version: '3.12'
+          python-version: '3.13'
       - uses: actions/cache@v1
         with:
           path: ~/.cache/pip
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 463faaf7d..b993109d1 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -4,7 +4,7 @@ repos:
     rev: v3.13.0
     hooks:
       - id: pyupgrade
-        args: ["--py38-plus"]
+        args: ["--py39-plus"]
   - repo: https://github.com/asottile/reorder_python_imports
     rev: v3.11.0
     hooks:
diff --git a/CHANGES.rst b/CHANGES.rst
index 62abfedc2..9f2d2cab4 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,6 +8,7 @@ Released 2024-01-06
 - Fix :class:`~fields.SelectMultipleField` value coercion on validation.
   :issue:`822` :pr:`823`
 - Move the repository to the pallets-eco organization.
+- Stop supporting Python 3.9 and start supporting Python 3.13 :pr:`855`
 
 Version 3.1.1
 -------------
diff --git a/docs/faq.rst b/docs/faq.rst
index fd81592d9..7df747494 100644
--- a/docs/faq.rst
+++ b/docs/faq.rst
@@ -57,7 +57,7 @@ you should have no unicode issues.
 What versions of Python are supported?
 --------------------------------------
 
-WTForms supports Python 3.8+
+WTForms supports Python 3.9+
 
 
 How can I contribute to WTForms?
diff --git a/pyproject.toml b/pyproject.toml
index c9d004ebb..d73a19d87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ classifiers = [
     "Programming Language :: Python",
     "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
 ]
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 dependencies = [
     "MarkupSafe",
 ]
diff --git a/tox.ini b/tox.ini
index 82ae66aa0..85c8a7899 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
     style
-    py{312,311,310,39,38,py3}
+    py{313,312,311,310,39,py3}
     docs
 skip_missing_interpreters = true