diff --git a/requirements.txt b/requirements.txt
index 48a6f45..a878dcb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,7 +8,7 @@ pyperclip==1.8.2
 pyxdg==0.28 # xdg module, used for wallpaper setting; optional, falls back to ~/.config
 rich==13.3.5
 stransi==0.3.0
-textual==0.36.0
+textual==0.37.1
 textual-dev==1.1.0 # for development (`textual` CLI)
 watchdog==3.0.0 # for development; optional (only used when --restart-on-changes is passed)
 types-Pillow==10.0.0.1 # for development
diff --git a/src/textual_paint/file_dialogs.py b/src/textual_paint/file_dialogs.py
index d7c81df..76fa93f 100644
--- a/src/textual_paint/file_dialogs.py
+++ b/src/textual_paint/file_dialogs.py
@@ -102,7 +102,9 @@ class FileDialogWindow(DialogWindow):
         Called when a file/folder is selected in the DirectoryTree.
 
         This message comes from Tree.
-        DirectoryTree gives FileSelected, but only for files, not folders.
+        ~~DirectoryTree gives FileSelected, but only for files, not folders.~~
+        Update: as of Textual 0.37.0, DirectoryTree gives DirectorySelected for folders.
+        TODO: does that make it cleaner, or is it still awkward because it's two different messages?
         """
         assert event.node.data
 
diff --git a/src/textual_paint/windows.py b/src/textual_paint/windows.py
index eeac19a..8054984 100644
--- a/src/textual_paint/windows.py
+++ b/src/textual_paint/windows.py
@@ -467,6 +467,7 @@ class MessageBox(DialogWindow):
             self.message_widget = message
         if error:
             # expandable error details
+            # TODO: use new Collapsible widget from Textual 0.37.0
             import traceback
             details = "\n".join(traceback.format_exception(error))
             self.details_widget = Container(Static(details, markup=False, classes="details"))