diff --git a/pyproject.toml b/pyproject.toml
index 8148505417..a2e2e4240d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -110,7 +110,7 @@ docs = [
 # of the default groups so no other environment installs the client (or the
 # legacy httpx it depends on). See i18n/README.md.
 translate = ["anthropic>=0.121.0"]
-codegen = ["datamodel-code-generator==0.57.0"]
+codegen = ["datamodel-code-generator==0.64.0"]
 
 [build-system]
 requires = ["hatchling", "uv-dynamic-versioning"]
diff --git a/uv.lock b/uv.lock
index 862cddfb17..9ee3a3db7b 100644
--- a/uv.lock
+++ b/uv.lock
@@ -505,22 +505,22 @@ wheels = [
 
 [[package]]
 name = "datamodel-code-generator"
-version = "0.57.0"
+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 = "pydantic" },
     { name = "pyyaml" },
     { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/5d/44/87d5980f813a1e323c5d726b3ac5fec8c915ce8a77fcdceaf9c00457dbae/datamodel_code_generator-0.57.0.tar.gz", hash = "sha256:0eda778ea06eaa476e542a5f1fe1d14cc3bbf686edb33a0ad6151c7d19089906", size = 932941, upload-time = "2026-05-07T16:21:55.819Z" }
+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/c5/c1/4fb9a44bb4a305b860c5a5b1866dcccfac3b76f5f170a9e68fc7733e16d2/datamodel_code_generator-0.57.0-py3-none-any.whl", hash = "sha256:d26bf5defe5154493d0aa5a822b7725332b9e9dd2abccc2f8856052286aa83b5", size = 259343, upload-time = "2026-05-07T16:21:53.823Z" },
+    { 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]]
@@ -661,15 +661,15 @@ wheels = [
 
 [[package]]
 name = "httpcore2"
-version = "2.10.0"
+version = "2.12.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "h11" },
     { name = "truststore" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/a9/83/a896fc59940fc5a6e2aff3a4be1d92fa890112936803b331cae75a993c34/httpcore2-2.10.0.tar.gz", hash = "sha256:13c0cc3d1919d4f28457f60cd2c2abe04113a8af184ccf1142811beba936f9dc", size = 67427, upload-time = "2026-08-09T09:11:32.123Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/be/ad/f4f0e57345f1870f3e8cb624e058d7eca6e5a27d33bcc3311d9b618734cd/httpcore2-2.12.0.tar.gz", hash = "sha256:9293522bba0aa7c4c8e9e3f040c16575bd8868e155a77fa30c7a9085a5eae648", size = 67548, upload-time = "2026-08-18T13:22:08.211Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/e5/4f/d149104195a35e2853a2fc203a8e3477747e58c80e17dda686dace174383/httpcore2-2.10.0-py3-none-any.whl", hash = "sha256:7df06cfb34070cae4f7c89be69dc1095eca138e9704ceffb98d25c1912ab6f01", size = 83000, upload-time = "2026-08-09T09:11:29.555Z" },
+    { url = "https://files.pythonhosted.org/packages/d2/74/d370e55600d9bcfa0d9794b0166126d49291a3d2b20c268fc98c453a4948/httpcore2-2.12.0-py3-none-any.whl", hash = "sha256:7e04258ce01013d7d615e5b910a3b27fac937d7a95038227e79652b4ba3b4ceb", size = 83074, upload-time = "2026-08-18T13:22:05.854Z" },
 ]
 
 [[package]]
@@ -689,7 +689,7 @@ wheels = [
 
 [[package]]
 name = "httpx2"
-version = "2.10.0"
+version = "2.12.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "anyio", marker = "sys_platform != 'emscripten'" },
@@ -699,9 +699,9 @@ dependencies = [
     { name = "truststore", marker = "sys_platform != 'emscripten'" },
     { name = "typing-extensions", marker = "python_full_version < '3.13'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/bd/3d/f9a8c07a3884f3e5b26205e8436a18b3af61c5d53192c3bea235574dbbec/httpx2-2.10.0.tar.gz", hash = "sha256:8741d7329fe2c7885fc9ceb61c8217acfb87a85f75723714b89ebf7ad7196338", size = 98749, upload-time = "2026-08-09T09:11:33.24Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/7f/f8/579a8b51e42e38ee32647df9f08aa25643ae788e275cc625b199829c4671/httpx2-2.12.0.tar.gz", hash = "sha256:7631fe9887a8a2275f4a2540e053aa670fcc50742864a9ae7c66e609fdcf12cf", size = 100040, upload-time = "2026-08-18T13:22:09.086Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/b9/6d/a637d52449d98a6892d9a4dc0262587afdb6a66f201871842dce5a97b1c1/httpx2-2.10.0-py3-none-any.whl", hash = "sha256:5e3194a432701e1cc6f69a8b1b2fa199ef907013fede8d9a09a2c5b7b8141a18", size = 94355, upload-time = "2026-08-09T09:11:30.882Z" },
+    { url = "https://files.pythonhosted.org/packages/c8/95/411ba65569158e862368917aaf56597f3e5fa3b91b0502919638465a08f3/httpx2-2.12.0-py3-none-any.whl", hash = "sha256:cc8b6eecb8661c146b8f89a60e97456ee086e91a784ed31ac450c3a9e613dd36", size = 95427, upload-time = "2026-08-18T13:22:06.834Z" },
 ]
 
 [[package]]
@@ -1108,7 +1108,7 @@ requires-dist = [
 provides-extras = ["cli", "rich"]
 
 [package.metadata.requires-dev]
-codegen = [{ name = "datamodel-code-generator", specifier = "==0.57.0" }]
+codegen = [{ name = "datamodel-code-generator", specifier = "==0.64.0" }]
 dev = [
     { name = "blockbuster", specifier = ">=1.5.27" },
     { name = "coverage", extras = ["toml"], specifier = ">=7.10.7,<=7.13" },