diff --git a/CHANGELOG.md b/CHANGELOG.md
index ba054c8..9db73c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
+## [0.13.1] - 2026-06-07
+
+### Fixed
+
+- Suppressed the spurious `googleapiclient.discovery_cache: file_cache is only supported with oauth2client<4.0.0` warning by passing `cache_discovery=False` when building the YouTube service. The file cache is incompatible with `google-auth` (which we use via `google-auth-oauthlib`); discovery docs are still cached in-memory for the life of the subprocess, which is all the dock's short-lived hook invocations need.
+
 ## [0.13.0] - 2026-04-20
 
 ### Added
diff --git a/pyproject.toml b/pyproject.toml
index 1baf6fc..4010660 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -66,6 +66,14 @@ ignore_missing_imports = true
 module = "google.*"
 ignore_missing_imports = true
 
+# ``google-auth`` ships without inline type hints — ``Credentials.refresh``,
+# ``Credentials.from_authorized_user_file`` etc. all trip mypy's strict
+# ``no-untyped-call`` check on newer mypy releases. Silence for our own
+# auth module so CI and local environments agree regardless of mypy version.
+[[tool.mypy.overrides]]
+module = "reeln_google_plugin.auth"
+disallow_untyped_calls = false
+
 [[tool.mypy.overrides]]
 module = "google_auth_oauthlib.*"
 ignore_missing_imports = true
diff --git a/reeln_google_plugin/__init__.py b/reeln_google_plugin/__init__.py
index 19a0693..87d6ca1 100644
--- a/reeln_google_plugin/__init__.py
+++ b/reeln_google_plugin/__init__.py
@@ -2,7 +2,7 @@
 
 from __future__ import annotations
 
-__version__ = "0.13.0"
+__version__ = "0.13.1"
 
 from reeln_google_plugin.plugin import GooglePlugin
 
diff --git a/reeln_google_plugin/auth.py b/reeln_google_plugin/auth.py
index 3dc867f..82ccc32 100644
--- a/reeln_google_plugin/auth.py
+++ b/reeln_google_plugin/auth.py
@@ -67,7 +67,7 @@ def get_credentials(
     creds: Credentials | None = None
 
     if credentials_cache.exists():
-        creds = Credentials.from_authorized_user_file(  # type: ignore[no-untyped-call]
+        creds = Credentials.from_authorized_user_file(
             str(credentials_cache), effective_scopes
         )
 
@@ -107,4 +107,10 @@ def build_youtube_service(credentials: Any) -> Any:
     except ImportError as exc:
         raise AuthError(f"Google API client library not installed: {exc}") from exc
 
-    return build("youtube", "v3", credentials=credentials)
+    # ``cache_discovery=False`` suppresses the noisy
+    # ``file_cache is only supported with oauth2client<4.0.0`` warning.
+    # The file cache is incompatible with ``google-auth`` (we use it via
+    # ``google-auth-oauthlib``), and discovery docs are still cached
+    # in-memory for the life of the process — which is all we need given
+    # that each CLI hook invocation runs in a short-lived subprocess.
+    return build("youtube", "v3", credentials=credentials, cache_discovery=False)
diff --git a/reeln_google_plugin/plugin.py b/reeln_google_plugin/plugin.py
index 5a9e34f..06728c9 100644
--- a/reeln_google_plugin/plugin.py
+++ b/reeln_google_plugin/plugin.py
@@ -30,7 +30,7 @@ class GooglePlugin:
     """
 
     name: str = "google"
-    version: str = "0.13.0"
+    version: str = "0.13.1"
     api_version: int = 1
 
     config_schema: PluginConfigSchema = PluginConfigSchema(
diff --git a/tests/unit/test_auth.py b/tests/unit/test_auth.py
index c9720c1..17bebf5 100644
--- a/tests/unit/test_auth.py
+++ b/tests/unit/test_auth.py
@@ -273,7 +273,14 @@ def test_builds_service(self) -> None:
             result = build_youtube_service(fake_creds)
 
         assert result is mock_service
-        mock_build.assert_called_once_with("youtube", "v3", credentials=fake_creds)
+        # ``cache_discovery=False`` is intentional: silences the
+        # ``file_cache only supported with oauth2client<4.0.0`` warning.
+        mock_build.assert_called_once_with(
+            "youtube",
+            "v3",
+            credentials=fake_creds,
+            cache_discovery=False,
+        )
 
     def test_import_error_raises_auth_error(self) -> None:
         with (