diff --git a/pyproject.toml b/pyproject.toml
index 0c5e7c81..c827db4e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -53,7 +53,7 @@ dev = [
     # See https://github.com/apify/apify-client-python/pull/582/ for more details.
     # We explicitly constrain black>=24.3.0 to override the transitive dependency.
     "black>=24.3.0",
-    "datamodel-code-generator[http,ruff]>=0.64.1,<1.0.0",
+    "datamodel-code-generator[http,ruff]>=0.85.0,<1.0.0",
     "griffe<3.0.0",
     "poethepoet<1.0.0",
     "pre-commit<5.0.0",
diff --git a/tests/unit/test_model_generation.py b/tests/unit/test_model_generation.py
index 54a5ac32..29db8ff8 100644
--- a/tests/unit/test_model_generation.py
+++ b/tests/unit/test_model_generation.py
@@ -5,8 +5,6 @@
 import sys
 from typing import TYPE_CHECKING
 
-import pytest
-
 from scripts.postprocess_generated_models import (
     REPO_ROOT,
     RESOURCE_INPUT_TYPEDDICTS,
@@ -58,10 +56,6 @@ def run_datamodel_codegen(*args: str) -> None:
     )
 
 
-@pytest.mark.skipif(
-    sys.version_info >= (3, 15),
-    reason='datamodel-code-generator fails to import on Python 3.15 (koxudaxi/datamodel-code-generator#4609)',
-)
 def test_model_generation_pipeline(tmp_path: Path) -> None:
     """The `generate-models` pipeline (both codegen passes and post-processing) runs on a minimal spec."""
     # PR CI never runs `poe generate-models`, so this catches a dependency update that breaks the generator.
diff --git a/uv.lock b/uv.lock
index 71ce4bc5..eb784766 100644
--- a/uv.lock
+++ b/uv.lock
@@ -100,7 +100,7 @@ provides-extras = ["brotli", "httpx2"]
 [package.metadata.requires-dev]
 dev = [
     { name = "black", specifier = ">=24.3.0" },
-    { name = "datamodel-code-generator", extras = ["http", "ruff"], specifier = ">=0.64.1,<1.0.0" },
+    { name = "datamodel-code-generator", extras = ["http", "ruff"], specifier = ">=0.85.0,<1.0.0" },
     { name = "griffe", specifier = "<3.0.0" },
     { name = "poethepoet", specifier = "<1.0.0" },
     { name = "pre-commit", specifier = "<5.0.0" },