diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7f737b852..2a72ed689 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,6 +72,7 @@ jobs:
           - '3.14t'
           - 'pypy3.10'
           - 'pypy3.11'
+          - 'graalpy-3.11'
 
     runs-on: ubuntu-latest
 
@@ -424,6 +425,10 @@ jobs:
             manylinux: auto
             target: x86_64
             interpreter: pypy3.10 pypy3.11
+          - os: linux
+            manylinux: auto
+            target: x86_64
+            interpreter: graalpy3.11
 
           # musllinux
           - os: linux
@@ -485,6 +490,7 @@ jobs:
           args: --release --out dist --interpreter ${{ matrix.interpreter || '3.9 3.10 3.11 3.12 3.13 3.14 pypy3.10 pypy3.11' }}
           rust-toolchain: stable
           docker-options: -e CI
+          before-script-linux: ${{ contains(matrix.interpreter, 'graalpy') && 'manylinux-interpreters ensure-all' || '' }}
 
       - run: ${{ (matrix.os == 'windows' && 'dir') || 'ls -lh' }} dist/
 
diff --git a/pyproject.toml b/pyproject.toml
index 202cf41b5..8cab50714 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,6 +27,9 @@ classifiers = [
     'Programming Language :: Python :: 3.12',
     'Programming Language :: Python :: 3.13',
     'Programming Language :: Python :: 3.14',
+    'Programming Language :: Python :: Implementation :: CPython',
+    'Programming Language :: Python :: Implementation :: PyPy',
+    'Programming Language :: Python :: Implementation :: GraalPy',
     'Programming Language :: Rust',
     'Framework :: Pydantic',
     'Intended Audience :: Developers',
diff --git a/tests/serializers/test_functions.py b/tests/serializers/test_functions.py
index c31c4e6b6..ec1ced855 100644
--- a/tests/serializers/test_functions.py
+++ b/tests/serializers/test_functions.py
@@ -661,8 +661,8 @@ def f(value, handler, _info):
 
 
 @pytest.mark.skipif(
-    platform.python_implementation() == 'PyPy' or sys.platform in {'emscripten', 'win32'},
-    reason='fails on pypy, emscripten and windows',
+    platform.python_implementation() in ('PyPy', 'GraalVM') or sys.platform in {'emscripten', 'win32'},
+    reason='fails on pypy, graalpy, emscripten and windows',
 )
 def test_recursive_call():
     def bad_recursive(value):
diff --git a/tests/test_errors.py b/tests/test_errors.py
index 3e52697dd..8a87489d7 100644
--- a/tests/test_errors.py
+++ b/tests/test_errors.py
@@ -1155,9 +1155,8 @@ def test_errors_include_url_envvar(env_var, env_var_value, expected_to_have_url)
     env.pop('PYDANTIC_ERRORS_OMIT_URL', None)  # in case the ambient environment has it set
     if env_var_value is not None:
         env[env_var] = env_var_value
-    env['PYTHONDEVMODE'] = '1'  # required to surface the deprecation warning
     result = subprocess.run(
-        [sys.executable, '-c', code],
+        [sys.executable, '-W', 'default', '-c', code],
         stdout=subprocess.PIPE,
         stderr=subprocess.STDOUT,
         encoding='utf-8',
diff --git a/tests/test_garbage_collection.py b/tests/test_garbage_collection.py
index 3b5bb3c4f..e53cdc564 100644
--- a/tests/test_garbage_collection.py
+++ b/tests/test_garbage_collection.py
@@ -25,6 +25,7 @@
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_gc_schema_serializer() -> None:
     # test for https://github.com/pydantic/pydantic/issues/5136
     class BaseModel:
@@ -53,6 +54,7 @@ class MyModel(BaseModel):
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_gc_schema_validator() -> None:
     # test for https://github.com/pydantic/pydantic/issues/5136
     class BaseModel:
@@ -81,6 +83,7 @@ class MyModel(BaseModel):
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_gc_validator_iterator() -> None:
     # test for https://github.com/pydantic/pydantic/issues/9243
     class MyModel:
diff --git a/tests/validators/test_dataclasses.py b/tests/validators/test_dataclasses.py
index 6ae9f54f9..93058d4e4 100644
--- a/tests/validators/test_dataclasses.py
+++ b/tests/validators/test_dataclasses.py
@@ -1519,6 +1519,7 @@ def test_dataclass_wrap_json():
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 @pytest.mark.parametrize('validator', [None, 'field', 'dataclass'])
 def test_leak_dataclass(validator):
     def fn():
diff --git a/tests/validators/test_datetime.py b/tests/validators/test_datetime.py
index 5e319dc23..a91a9de52 100644
--- a/tests/validators/test_datetime.py
+++ b/tests/validators/test_datetime.py
@@ -276,7 +276,7 @@ def tzname(self, _dt):
         schema.validate_python(dt)
 
     # exception messages differ between python and pypy
-    if platform.python_implementation() == 'PyPy':
+    if platform.python_implementation() in ('PyPy', 'GraalVM'):
         error_message = 'NotImplementedError: tzinfo subclass must override utcoffset()'
     else:
         error_message = 'NotImplementedError: a tzinfo subclass must implement utcoffset()'
@@ -489,7 +489,7 @@ def test_neg_7200():
 
 
 def test_tz_constraint_too_high():
-    with pytest.raises(SchemaError, match='OverflowError: Python int too large to convert to C long'):
+    with pytest.raises(SchemaError, match='OverflowError: Python int too large.*'):
         SchemaValidator(core_schema.datetime_schema(tz_constraint=2**64))
 
 
diff --git a/tests/validators/test_model_init.py b/tests/validators/test_model_init.py
index 463a9a48a..59dc8a15b 100644
--- a/tests/validators/test_model_init.py
+++ b/tests/validators/test_model_init.py
@@ -414,6 +414,7 @@ def __init__(self, **kwargs):
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 @pytest.mark.parametrize('validator', [None, 'field', 'model'])
 def test_leak_model(validator):
     def fn():
diff --git a/tests/validators/test_nullable.py b/tests/validators/test_nullable.py
index 779b2507d..af73a8875 100644
--- a/tests/validators/test_nullable.py
+++ b/tests/validators/test_nullable.py
@@ -42,6 +42,7 @@ def test_union_nullable_bool_int():
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_leak_nullable():
     def fn():
         def validate(v, info):
diff --git a/tests/validators/test_time.py b/tests/validators/test_time.py
index 9a643acfb..78ca0a9e7 100644
--- a/tests/validators/test_time.py
+++ b/tests/validators/test_time.py
@@ -293,5 +293,5 @@ def test_neg_7200():
 
 
 def test_tz_constraint_too_high():
-    with pytest.raises(SchemaError, match='OverflowError: Python int too large to convert to C long'):
+    with pytest.raises(SchemaError, match='OverflowError: Python int too large.*'):
         SchemaValidator(core_schema.time_schema(tz_constraint=2**64))
diff --git a/tests/validators/test_typed_dict.py b/tests/validators/test_typed_dict.py
index 3d96d40e0..f7bd47aba 100644
--- a/tests/validators/test_typed_dict.py
+++ b/tests/validators/test_typed_dict.py
@@ -1143,6 +1143,7 @@ def test_extra_behavior_ignore(config: Union[core_schema.CoreConfig, None], sche
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_leak_typed_dict():
     def fn():
         def validate(v, info):
diff --git a/tests/validators/test_with_default.py b/tests/validators/test_with_default.py
index bb8775305..c0b8db8f8 100644
--- a/tests/validators/test_with_default.py
+++ b/tests/validators/test_with_default.py
@@ -645,6 +645,7 @@ def val_func(v: Any, handler: core_schema.ValidatorFunctionWrapHandler) -> Any:
 @pytest.mark.xfail(
     condition=platform.python_implementation() == 'PyPy', reason='https://foss.heptapod.net/pypy/pypy/-/issues/3899'
 )
+@pytest.mark.skipif(platform.python_implementation() == 'GraalVM', reason='Cannot reliably trigger GC on GraalPy')
 def test_leak_with_default():
     def fn():
         class Defaulted(int):