diff --git a/HISTORY.md b/HISTORY.md
index 8b3239f2..725e6d4c 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -27,6 +27,8 @@ Our backwards-compatibility policy can be found [here](https://github.com/python
 - Many preconf converters (_bson_, stdlib JSON, _cbor2_, _msgpack_, _msgspec_, _orjson_, _ujson_) skip unstructuring `int` and `str` enums,
   leaving them to the underlying libraries to handle with greater efficiency.
   ([#598](https://github.com/python-attrs/cattrs/pull/598))
+- The {class}`msgspec JSON preconf converter <cattrs.preconf.msgspec.MsgspecJsonConverter>` now handles dataclasses with private attributes more efficiently.
+  ([#624](https://github.com/python-attrs/cattrs/pull/624))
 - Literals containing enums are now unstructured properly, and their unstructuring is greatly optimized in the _bson_, stdlib JSON, _cbor2_, _msgpack_, _msgspec_, _orjson_ and _ujson_ preconf converters.
   ([#598](https://github.com/python-attrs/cattrs/pull/598))
 - Preconf converters now handle dictionaries with literal keys properly.
diff --git a/pdm.lock b/pdm.lock
index 4eaffe3d..ff61c3a5 100644
--- a/pdm.lock
+++ b/pdm.lock
@@ -3,9 +3,9 @@
 
 [metadata]
 groups = ["default", "bench", "bson", "cbor2", "docs", "lint", "msgpack", "msgspec", "orjson", "pyyaml", "test", "tomlkit", "ujson"]
-strategy = ["cross_platform"]
+strategy = []
 lock_version = "4.5.0"
-content_hash = "sha256:44dbb6f72865818bf643b1ae667d8a03342bdc2e12882fd4113b5ab39a87bd1f"
+content_hash = "sha256:15cea4815e528d6add51eaa9d3b5e1e2fa9dd66b5d1d28faea21433bd10ec258"
 
 [[metadata.targets]]
 requires_python = ">=3.9"
@@ -647,46 +647,46 @@ files = [
 
 [[package]]
 name = "msgspec"
-version = "0.18.6"
-requires_python = ">=3.8"
+version = "0.19.0"
+requires_python = ">=3.9"
 summary = "A fast serialization and validation library, with builtin support for JSON, MessagePack, YAML, and TOML."
 files = [
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-    {file = "msgspec-0.18.6-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:1a76b60e501b3932782a9da039bd1cd552b7d8dec54ce38332b87136c64852dd"},
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-    {file = "msgspec-0.18.6-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:c61ee4d3be03ea9cd089f7c8e36158786cd06e51fbb62529276452bbf2d52ece"},
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-    {file = "msgspec-0.18.6.tar.gz", hash = "sha256:a59fc3b4fcdb972d09138cb516dbde600c99d07c38fd9372a6ef500d2d031b4e"},
+    {file = "msgspec-0.19.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:d8dd848ee7ca7c8153462557655570156c2be94e79acec3561cf379581343259"},
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+    {file = "msgspec-0.19.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:aa77046904db764b0462036bc63ef71f02b75b8f72e9c9dd4c447d6da1ed8f8e"},
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+    {file = "msgspec-0.19.0-cp312-cp312-win_amd64.whl", hash = "sha256:067f0de1c33cfa0b6a8206562efdf6be5985b988b53dd244a8e06f993f27c8c0"},
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+    {file = "msgspec-0.19.0-cp313-cp313-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:19746b50be214a54239aab822964f2ac81e38b0055cca94808359d779338c10e"},
+    {file = "msgspec-0.19.0-cp313-cp313-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:60ef4bdb0ec8e4ad62e5a1f95230c08efb1f64f32e6e8dd2ced685bcc73858b5"},
+    {file = "msgspec-0.19.0-cp313-cp313-musllinux_1_2_aarch64.whl", hash = "sha256:ac7f7c377c122b649f7545810c6cd1b47586e3aa3059126ce3516ac7ccc6a6a9"},
+    {file = "msgspec-0.19.0-cp313-cp313-musllinux_1_2_x86_64.whl", hash = "sha256:a5bc1472223a643f5ffb5bf46ccdede7f9795078194f14edd69e3aab7020d327"},
+    {file = "msgspec-0.19.0-cp313-cp313-win_amd64.whl", hash = "sha256:317050bc0f7739cb30d257ff09152ca309bf5a369854bbf1e57dffc310c1f20f"},
+    {file = "msgspec-0.19.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:15c1e86fff77184c20a2932cd9742bf33fe23125fa3fcf332df9ad2f7d483044"},
+    {file = "msgspec-0.19.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:3b5541b2b3294e5ffabe31a09d604e23a88533ace36ac288fa32a420aa38d229"},
+    {file = "msgspec-0.19.0-cp39-cp39-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:0f5c043ace7962ef188746e83b99faaa9e3e699ab857ca3f367b309c8e2c6b12"},
+    {file = "msgspec-0.19.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:ca06aa08e39bf57e39a258e1996474f84d0dd8130d486c00bec26d797b8c5446"},
+    {file = "msgspec-0.19.0-cp39-cp39-musllinux_1_2_aarch64.whl", hash = "sha256:e695dad6897896e9384cf5e2687d9ae9feaef50e802f93602d35458e20d1fb19"},
+    {file = "msgspec-0.19.0-cp39-cp39-musllinux_1_2_x86_64.whl", hash = "sha256:3be5c02e1fee57b54130316a08fe40cca53af92999a302a6054cd451700ea7db"},
+    {file = "msgspec-0.19.0-cp39-cp39-win_amd64.whl", hash = "sha256:0684573a821be3c749912acf5848cce78af4298345cb2d7a8b8948a0a5a27cfe"},
+    {file = "msgspec-0.19.0.tar.gz", hash = "sha256:604037e7cd475345848116e89c553aa9a233259733ab51986ac924ab1b976f8e"},
 ]
 
 [[package]]
diff --git a/pyproject.toml b/pyproject.toml
index 0acf7f69..fb165065 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.black]
 skip-magic-trailing-comma = true
 
-[tool.pdm.dev-dependencies]
+[dependency-groups]
 lint = [
     "black>=24.2.0",
     "ruff>=0.0.277",
@@ -93,7 +93,7 @@ bson = [
     "pymongo>=4.4.0",
 ]
 msgspec = [
-    "msgspec>=0.18.5; implementation_name == \"cpython\"",
+    "msgspec>=0.19.0; implementation_name == \"cpython\"",
 ]
 
 [tool.pytest.ini_options]
diff --git a/src/cattrs/preconf/msgspec.py b/src/cattrs/preconf/msgspec.py
index 3fa1a3b6..6274a32b 100644
--- a/src/cattrs/preconf/msgspec.py
+++ b/src/cattrs/preconf/msgspec.py
@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from base64 import b64decode
+from dataclasses import is_dataclass
 from datetime import date, datetime
 from enum import Enum
 from functools import partial
@@ -13,15 +14,7 @@
 from msgspec import Struct, convert, to_builtins
 from msgspec.json import Encoder, decode
 
-from .._compat import (
-    fields,
-    get_args,
-    get_origin,
-    has,
-    is_bare,
-    is_mapping,
-    is_sequence,
-)
+from .._compat import fields, get_args, get_origin, is_bare, is_mapping, is_sequence
 from ..cols import is_namedtuple
 from ..converters import BaseConverter, Converter
 from ..dispatch import UnstructureHook
@@ -104,11 +97,20 @@ def configure_passthroughs(converter: Converter) -> None:
     """Configure optimizing passthroughs.
 
     A passthrough is when we let msgspec handle something automatically.
+
+    .. versionchanged:: 25.1.0
+        Dataclasses with private attributes are now passed through.
     """
     converter.register_unstructure_hook(bytes, to_builtins)
     converter.register_unstructure_hook_factory(is_mapping, mapping_unstructure_factory)
     converter.register_unstructure_hook_factory(is_sequence, seq_unstructure_factory)
-    converter.register_unstructure_hook_factory(has, msgspec_attrs_unstructure_factory)
+    converter.register_unstructure_hook_factory(
+        attrs_has, msgspec_attrs_unstructure_factory
+    )
+    converter.register_unstructure_hook_factory(
+        is_dataclass,
+        partial(msgspec_attrs_unstructure_factory, msgspec_skips_private=False),
+    )
     converter.register_unstructure_hook_factory(
         is_namedtuple, namedtuple_unstructure_factory
     )
@@ -154,16 +156,21 @@ def mapping_unstructure_factory(type, converter: BaseConverter) -> UnstructureHo
 
 
 def msgspec_attrs_unstructure_factory(
-    type: Any, converter: Converter
+    type: Any, converter: Converter, msgspec_skips_private: bool = True
 ) -> UnstructureHook:
-    """Choose whether to use msgspec handling or our own."""
+    """Choose whether to use msgspec handling or our own.
+
+    Args:
+        msgspec_skips_private: Whether the msgspec library skips unstructuring
+            private attributes, making us do the work.
+    """
     origin = get_origin(type)
     attribs = fields(origin or type)
     if attrs_has(type) and any(isinstance(a.type, str) for a in attribs):
         resolve_types(type)
         attribs = fields(origin or type)
 
-    if any(
+    if msgspec_skips_private and any(
         attr.name.startswith("_")
         or (
             converter.get_unstructure_hook(attr.type, cache_result=False)
diff --git a/tests/conftest.py b/tests/conftest.py
index 4b014dfc..d295990e 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -37,5 +37,3 @@ def converter_cls(request):
     collect_ignore_glob.append("*_695.py")
 if platform.python_implementation() == "PyPy":
     collect_ignore_glob.append("*_cpython.py")
-if sys.version_info >= (3, 13):  # Remove when msgspec supports 3.13.
-    collect_ignore_glob.append("*test_msgspec_cpython.py")
diff --git a/tests/preconf/test_msgspec_cpython.py b/tests/preconf/test_msgspec_cpython.py
index 3e6c4362..1576c039 100644
--- a/tests/preconf/test_msgspec_cpython.py
+++ b/tests/preconf/test_msgspec_cpython.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+from dataclasses import dataclass
 from enum import Enum
 from typing import (
     Any,
@@ -48,6 +49,18 @@ class C:
     _a: int
 
 
+@dataclass
+class DataclassA:
+    a: int
+
+
+@dataclass
+class DataclassC:
+    """Msgspec doesn't skip private attributes on dataclasses, so this should work OOB."""
+
+    _a: int
+
+
 class N(NamedTuple):
     a: int
 
@@ -107,6 +120,11 @@ def test_unstructure_pt_product_types(converter: Conv):
     assert not is_passthrough(converter.get_unstructure_hook(B))
     assert not is_passthrough(converter.get_unstructure_hook(C))
 
+    assert is_passthrough(converter.get_unstructure_hook(DataclassA))
+    assert is_passthrough(converter.get_unstructure_hook(DataclassC))
+
+    assert converter.unstructure(DataclassC(1)) == {"_a": 1}
+
     assert is_passthrough(converter.get_unstructure_hook(N))
     assert is_passthrough(converter.get_unstructure_hook(NA))
     assert not is_passthrough(converter.get_unstructure_hook(NC))
diff --git a/tox.ini b/tox.ini
index 535a740c..c2decef5 100644
--- a/tox.ini
+++ b/tox.ini
@@ -48,9 +48,6 @@ setenv =
     PDM_IGNORE_SAVED_PYTHON="1"
     COVERAGE_PROCESS_START={toxinidir}/pyproject.toml
     COVERAGE_CORE=sysmon
-commands_pre =
-    pdm sync -G ujson,msgpack,pyyaml,tomlkit,cbor2,bson,orjson,test
-    python -c 'import pathlib; pathlib.Path("{env_site_packages_dir}/cov.pth").write_text("import coverage; coverage.process_startup()")'
 
 [testenv:pypy3]
 setenv =