diff --git a/.github/workflows/generate_document.yml b/.github/workflows/generate_document.yml
index c4af6b80b..d63a2f819 100644
--- a/.github/workflows/generate_document.yml
+++ b/.github/workflows/generate_document.yml
@@ -65,9 +65,6 @@ jobs:
           working-directory: "docs/apis/c_api/doxygen"
       - name: Build voicevox_core_python_api
         run: maturin develop --manifest-path ./crates/voicevox_core_python_api/Cargo.toml --locked
-      # https://github.com/readthedocs/sphinx-autoapi/issues/405
-      - name: Workaround to make Sphinx recognize `_rust` as a module
-        run: touch ./crates/voicevox_core_python_api/python/voicevox_core/_rust/__init__.py
       - name: Generate Sphinx document
         run: sphinx-build docs/apis/python_api public/apis/python_api
       - name: Generate Javadoc
diff --git a/crates/voicevox_core_python_api/poetry.lock b/crates/voicevox_core_python_api/poetry.lock
index 0decb2a6a..911dfafc2 100644
--- a/crates/voicevox_core_python_api/poetry.lock
+++ b/crates/voicevox_core_python_api/poetry.lock
@@ -1,4 +1,4 @@
-# This file is automatically @generated by Poetry 1.7.1 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "accessible-pygments"
@@ -39,17 +39,6 @@ files = [
 [package.dependencies]
 typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.9\""}
 
-[[package]]
-name = "anyascii"
-version = "0.3.2"
-description = "Unicode to ASCII transliteration"
-optional = false
-python-versions = ">=3.3"
-files = [
-    {file = "anyascii-0.3.2-py3-none-any.whl", hash = "sha256:3b3beef6fc43d9036d3b0529050b0c48bfad8bc960e9e562d7223cfb94fe45d4"},
-    {file = "anyascii-0.3.2.tar.gz", hash = "sha256:9d5d32ef844fe225b8bc7cba7f950534fae4da27a9bf3a6bea2cb0ea46ce4730"},
-]
-
 [[package]]
 name = "astroid"
 version = "3.0.1"
@@ -923,17 +912,16 @@ test = ["cython", "filelock", "html5lib", "pytest (>=4.6)"]
 
 [[package]]
 name = "sphinx-autoapi"
-version = "3.0.0"
+version = "3.1.0"
 description = "Sphinx API documentation generator"
 optional = false
 python-versions = ">=3.8"
 files = [
-    {file = "sphinx-autoapi-3.0.0.tar.gz", hash = "sha256:09ebd674a32b44467222b0fb8a917b97c89523f20dbf05b52cb8a3f0e15714de"},
-    {file = "sphinx_autoapi-3.0.0-py2.py3-none-any.whl", hash = "sha256:ea207793cba1feff7b2ded0e29364f2995a4d157303a98603cee0ce94cea2688"},
+    {file = "sphinx_autoapi-3.1.0-py2.py3-none-any.whl", hash = "sha256:b102ded12ff5397ff6f9536065644c0a01a203b1d53dac07419c267fd771367f"},
+    {file = "sphinx_autoapi-3.1.0.tar.gz", hash = "sha256:c5455191c36af19e0de73dd52e15feb04a37ca4439fa5e8d77f1941768c15d32"},
 ]
 
 [package.dependencies]
-anyascii = "*"
 astroid = [
     {version = ">=2.7", markers = "python_version < \"3.12\""},
     {version = ">=3.0.0a1", markers = "python_version >= \"3.12\""},
@@ -1091,4 +1079,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8,<3.13"
-content-hash = "42faee9d02ea5ad43eaef485f2127f0ffd77a5f8951ef71529eb1e85249e9c04"
+content-hash = "68fffc23b63507c95b965429a6a54f161f8c6a94fe98b6dcad001475f690b6a3"
diff --git a/crates/voicevox_core_python_api/pyproject.toml b/crates/voicevox_core_python_api/pyproject.toml
index 4ae2da74a..ac9dba7b3 100644
--- a/crates/voicevox_core_python_api/pyproject.toml
+++ b/crates/voicevox_core_python_api/pyproject.toml
@@ -44,7 +44,7 @@ pydantic = ">=2.5.2,<3"
 [tool.poetry.group.docs.dependencies]
 sphinx = "6.2.1"
 pydata-sphinx-theme = "0.14.1"
-sphinx-autoapi = "3.0.0"
+sphinx-autoapi = "3.1.0"
 
 [tool.poetry.group.dev.dependencies]
 maturin = "1.3.1"
diff --git a/docs/apis/python_api/conf.py b/docs/apis/python_api/conf.py
index b1695b750..60f9df90e 100644
--- a/docs/apis/python_api/conf.py
+++ b/docs/apis/python_api/conf.py
@@ -32,7 +32,7 @@
 ]
 
 # templates_path = ['_templates']
-exclude_patterns = []
+exclude_patterns = ["autoapi/*/_rust/*"] # パブリックAPIを意図した部分ではなく、またorphan扱いとなって警告が出るため
 
 
 # -- Options for HTML output -------------------------------------------------