diff --git a/pyproject.toml b/pyproject.toml
index 3c814106d..82254970b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -103,7 +103,7 @@ docs = [
     # `griffe`; the old `griffe` distribution is the incompatible 1.x line.
     "griffelib==2.1.0",
 ]
-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 b992b278a..e22872e49 100644
--- a/uv.lock
+++ b/uv.lock
@@ -477,22 +477,22 @@ 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]]
@@ -915,7 +915,7 @@ 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 = "coverage", extras = ["toml"], specifier = ">=7.10.7,<=7.13" },
     { name = "dirty-equals", specifier = ">=0.9.0" },