diff --git a/packages/bigframes/testing/constraints-3.11.txt b/packages/bigframes/testing/constraints-3.11.txt
index 831d22b0ff7a..7dd169b552b6 100644
--- a/packages/bigframes/testing/constraints-3.11.txt
+++ b/packages/bigframes/testing/constraints-3.11.txt
@@ -91,7 +91,7 @@ dbus-python==1.2.18
 debugpy==1.8.15
 decorator==4.4.2
 defusedxml==0.7.1
-diffusers==0.34.0
+diffusers==0.38.0
 dill==0.3.8
 distributed==2025.5.0
 distributed-ucxx-cu12==0.44.0