diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index b1f9216b8..3a138517f 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -21,11 +21,11 @@ jobs:
       fail-fast: false
       matrix:
         include:
+          - {python: '3.14'}
           - {python: '3.13'}
           - {python: '3.12'}
           - {python: '3.11'}
           - {python: '3.10'}
-          - {python: '3.9'}
     steps:
       - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
       - uses: actions/setup-python@39cd14951b08e74b54015e9e001cdefcf80e669f # v5.1.1
diff --git a/CHANGES.rst b/CHANGES.rst
index f8e865e6b..014f60acd 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -6,6 +6,7 @@ Unreleased
 Unreleased
 
 - Fix :class:`~validators.Disabled` validation with provided formdata. :pr:`880`
+- End support for Python 3.9, start support for Python 3.14. :pr:`883`
 
 Version 3.2.1
 -------------
diff --git a/pyproject.toml b/pyproject.toml
index 3e9198dc6..51499a7e0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ classifiers = [
     "Programming Language :: Python",
     "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = [
     "MarkupSafe",
 ]
diff --git a/src/wtforms/fields/choices.py b/src/wtforms/fields/choices.py
index 62ed49763..180927066 100644
--- a/src/wtforms/fields/choices.py
+++ b/src/wtforms/fields/choices.py
@@ -114,11 +114,11 @@ def _choices_generator(self, choices):
         if not choices:
             _choices = []
 
-        elif isinstance(choices[0], (list, tuple)):
+        elif isinstance(choices[0], list | tuple):
             _choices = choices
 
         else:
-            _choices = zip(choices, choices)
+            _choices = zip(choices, choices, strict=False)
 
         for value, label, *other_args in _choices:
             selected = self.coerce(value) == self.data
@@ -168,11 +168,11 @@ def _choices_generator(self, choices):
         if not choices:
             _choices = []
 
-        elif isinstance(choices[0], (list, tuple)):
+        elif isinstance(choices[0], list | tuple):
             _choices = choices
 
         else:
-            _choices = zip(choices, choices)
+            _choices = zip(choices, choices, strict=False)
 
         for value, label, *other_args in _choices:
             selected = self.data is not None and self.coerce(value) in self.data
diff --git a/src/wtforms/fields/list.py b/src/wtforms/fields/list.py
index dabd8b404..e80beefa0 100644
--- a/src/wtforms/fields/list.py
+++ b/src/wtforms/fields/list.py
@@ -144,7 +144,7 @@ def populate_obj(self, obj, name):
         candidates = itertools.chain(ivalues, itertools.repeat(None))
         _fake = type("_fake", (object,), {})
         output = []
-        for field, data in zip(self.entries, candidates):
+        for field, data in zip(self.entries, candidates, strict=False):
             fake_obj = _fake()
             fake_obj.data = data
             field.populate_obj(fake_obj, "data")
diff --git a/tests/common.py b/tests/common.py
index c8d28a0f3..22ca613ac 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -1,6 +1,6 @@
 class DummyPostData(dict):
     def getlist(self, key):
         v = self[key]
-        if not isinstance(v, (list, tuple)):
+        if not isinstance(v, list | tuple):
             v = [v]
         return v
diff --git a/tox.ini b/tox.ini
index 58ce365df..31533a7b4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,7 +1,7 @@
 [tox]
 envlist =
     style
-    py{313,312,311,310,39,py3}
+    py{314,313,312,311,310,py310}
     docs
 skip_missing_interpreters = true