diff --git a/sdk/python/pyproject.toml b/sdk/python/pyproject.toml
index a6ff55ee74..5a464f3702 100644
--- a/sdk/python/pyproject.toml
+++ b/sdk/python/pyproject.toml
@@ -28,7 +28,7 @@ Documentation = "https://github.com/openai/codex/tree/main/sdk/python/docs"
 format = ["ruff>=0.15.8"]
 test = [
   "pytest>=8.0",
-  "datamodel-code-generator==0.31.2",
+  "datamodel-code-generator==0.64.0",
   { include-group = "format" },
 ]
 dev = [
diff --git a/sdk/python/uv.lock b/sdk/python/uv.lock
index 33618337a3..09f2e2b1dc 100644
--- a/sdk/python/uv.lock
+++ b/sdk/python/uv.lock
@@ -1,6 +1,10 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
+resolution-markers = [
+    "python_full_version >= '3.14'",
+    "python_full_version < '3.14'",
+]
 
 [options]
 exclude-newer = "0001-01-01T00:00:00Z" # This has no effect and is included for backwards compatibility when using relative exclude-newer values.
@@ -94,23 +98,22 @@ wheels = [
 
 [[package]]
 name = "datamodel-code-generator"
-version = "0.31.2"
+version = "0.64.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "argcomplete" },
-    { name = "black" },
+    { name = "black", marker = "sys_platform != 'emscripten'" },
     { name = "genson" },
     { name = "inflect" },
-    { name = "isort" },
+    { name = "isort", marker = "sys_platform != 'emscripten'" },
     { name = "jinja2" },
-    { name = "packaging" },
     { name = "pydantic" },
     { name = "pyyaml" },
-    { name = "tomli", marker = "python_full_version < '3.12'" },
+    { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/07/40/26399980314bedb3a8ec6a31da646d190cd945192410ad3ab6eabe0a1c73/datamodel_code_generator-0.31.2.tar.gz", hash = "sha256:47887b8aa6fd69865e07e2893c1e76e34dae753b9a97f1020357af8337bc4cdb", size = 453381, upload-time = "2025-06-22T17:40:56.491Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/9c/d2/86c94a2836ed42231653a7ddaefa0a5bc23418167a876bba7376c96b3a35/datamodel_code_generator-0.64.0.tar.gz", hash = "sha256:9c592900a00b20e416494273c22435f5a9aef6ea8c7b9190747522a60497a1cb", size = 1316440, upload-time = "2026-06-14T17:24:50.528Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/88/82/9bda726b117967b8056315e51125633ec7a0d2f862c202aed01c3fde2e9f/datamodel_code_generator-0.31.2-py3-none-any.whl", hash = "sha256:78f200a9e673ee4d041e96e82a835273baf4ce15e446d46501c0433d82af3ef5", size = 119369, upload-time = "2025-06-22T17:40:54.615Z" },
+    { url = "https://files.pythonhosted.org/packages/23/94/71338e2f0146ac10747a5537b3a1e45256e66b7c229869eb0ee787111b41/datamodel_code_generator-0.64.0-py3-none-any.whl", hash = "sha256:b7cd8bd41a312aa997aec6150670bad781847c5b674f17e4d70e78208a0fb990", size = 374698, upload-time = "2026-06-14T17:24:48.809Z" },
 ]
 
 [[package]]
@@ -312,13 +315,13 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "datamodel-code-generator", specifier = "==0.31.2" },
+    { name = "datamodel-code-generator", specifier = "==0.64.0" },
     { name = "pytest", specifier = ">=8.0" },
     { name = "ruff", specifier = ">=0.15.8" },
 ]
 format = [{ name = "ruff", specifier = ">=0.15.8" }]
 test = [
-    { name = "datamodel-code-generator", specifier = "==0.31.2" },
+    { name = "datamodel-code-generator", specifier = "==0.64.0" },
     { name = "pytest", specifier = ">=8.0" },
     { name = "ruff", specifier = ">=0.15.8" },
 ]