diff --git a/.vscode/settings.json b/.vscode/settings.json
index a85e6993..1ca046d9 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -19,6 +19,5 @@
         "reportUnknownParameterType": "warning",
         "reportUnknownVariableType": "none",
         "reportUnusedFunction": "none",
-        "reportUnusedImport": "none",
     },
 }
diff --git a/voicevox_engine/library_manager.py b/voicevox_engine/library_manager.py
index 50217e91..5bc18790 100644
--- a/voicevox_engine/library_manager.py
+++ b/voicevox_engine/library_manager.py
@@ -1,4 +1,3 @@
-import base64
 import json
 import os
 import shutil