diff --git a/pyproject.toml b/pyproject.toml
index 6ec8d63..29cb3c0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
     'midi_const~=0.1.0',
     'mido~=1.3.0', # FIXME: currently using custom 1.2.11a1 with EOX, running status and delta time support
     'python-rtmidi~=1.5.5', # While it's mido's default backend, we explicitly require it for some features.
-    'Pillow>=9.5,<10.2',
+    'Pillow>=9.5,<10.4',
 ]
 license = { file = 'LICENSE' }
 authors = [