diff --git a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
index 130695283..c8af71d84 100644
--- a/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
+++ b/packages/jupyter-ai/jupyter_ai/document_loaders/directory.py
@@ -30,7 +30,7 @@ def arxiv_to_text(id: str, output_dir: str) -> str:
         output path to the downloaded TeX file
     """
 
-    import arxiv  # type:ignore[import-not-found]
+    import arxiv  # type:ignore[import-not-found,import-untyped]
 
     outfile = f"{id}-{datetime.now():%Y-%m-%d-%H-%M}.tex"
     download_filename = "downloaded-paper.tar.gz"
diff --git a/packages/jupyter-ai/jupyter_ai/handlers.py b/packages/jupyter-ai/jupyter_ai/handlers.py
index 9de16f9eb..7c4f16e63 100644
--- a/packages/jupyter-ai/jupyter_ai/handlers.py
+++ b/packages/jupyter-ai/jupyter_ai/handlers.py
@@ -143,6 +143,7 @@ def get_chat_user(self) -> ChatUser:
         environment."""
         # Get a dictionary of all loaded extensions.
         # (`serverapp` is a property on all `JupyterHandler` subclasses)
+        assert self.serverapp
         extensions = self.serverapp.extension_manager.extensions
         collaborative = (
             "jupyter_collaboration" in extensions
@@ -512,7 +513,7 @@ def post(self):
 
 class ApiKeysHandler(BaseAPIHandler):
     @property
-    def config_manager(self) -> ConfigManager:
+    def config_manager(self) -> ConfigManager:  # type:ignore[override]
         return self.settings["jai_config_manager"]
 
     @web.authenticated
@@ -527,7 +528,7 @@ class SlashCommandsInfoHandler(BaseAPIHandler):
     """List slash commands that are currently available to the user."""
 
     @property
-    def config_manager(self) -> ConfigManager:
+    def config_manager(self) -> ConfigManager:  # type:ignore[override]
         return self.settings["jai_config_manager"]
 
     @property