diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 2653b8f..8d58a58 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "1.2.8"
+  ".": "1.2.9"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2cb66c8..ebf0a86 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 1.2.9 (2024-11-22)
+
+Full Changelog: [v1.2.8...v1.2.9](https://github.com/OneBusAway/python-sdk/compare/v1.2.8...v1.2.9)
+
+### Chores
+
+* **internal:** fix compat model_dump method when warnings are passed ([#158](https://github.com/OneBusAway/python-sdk/issues/158)) ([699d488](https://github.com/OneBusAway/python-sdk/commit/699d4889cf96d12c9fc0c538e228daaab97084be))
+
 ## 1.2.8 (2024-11-18)
 
 Full Changelog: [v1.2.7...v1.2.8](https://github.com/OneBusAway/python-sdk/compare/v1.2.7...v1.2.8)
diff --git a/pyproject.toml b/pyproject.toml
index 59a90c0..3f079a8 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "onebusaway"
-version = "1.2.8"
+version = "1.2.9"
 description = "The official Python library for the onebusaway-sdk API"
 dynamic = ["readme"]
 license = "Apache-2.0"
diff --git a/src/onebusaway/_compat.py b/src/onebusaway/_compat.py
index 4794129..df173f8 100644
--- a/src/onebusaway/_compat.py
+++ b/src/onebusaway/_compat.py
@@ -145,7 +145,8 @@ def model_dump(
             exclude=exclude,
             exclude_unset=exclude_unset,
             exclude_defaults=exclude_defaults,
-            warnings=warnings,
+            # warnings are not supported in Pydantic v1
+            warnings=warnings if PYDANTIC_V2 else True,
         )
     return cast(
         "dict[str, Any]",
diff --git a/src/onebusaway/_version.py b/src/onebusaway/_version.py
index 69905b8..499f851 100644
--- a/src/onebusaway/_version.py
+++ b/src/onebusaway/_version.py
@@ -1,4 +1,4 @@
 # File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
 
 __title__ = "onebusaway"
-__version__ = "1.2.8"  # x-release-please-version
+__version__ = "1.2.9"  # x-release-please-version
diff --git a/tests/test_models.py b/tests/test_models.py
index dd618a4..b1c88ed 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -561,6 +561,14 @@ class Model(BaseModel):
             m.model_dump(warnings=False)
 
 
+def test_compat_method_no_error_for_warnings() -> None:
+    class Model(BaseModel):
+        foo: Optional[str]
+
+    m = Model(foo="hello")
+    assert isinstance(model_dump(m, warnings=False), dict)
+
+
 def test_to_json() -> None:
     class Model(BaseModel):
         foo: Optional[str] = Field(alias="FOO", default=None)