diff --git a/constraints.txt b/constraints.txt
index f6b8e1dbc..1bc84335e 100644
--- a/constraints.txt
+++ b/constraints.txt
@@ -1,2 +1,3 @@
 decorator==4.4.2
 importlib-metadata==4.13.0;python_version<'3.8'
+pillow<10.0.0