diff --git a/testing/constraints-3.11.txt b/testing/constraints-3.11.txt
index e7110ef6bb..62acf90a5b 100644
--- a/testing/constraints-3.11.txt
+++ b/testing/constraints-3.11.txt
@@ -12,4 +12,5 @@ pytest-xdist==3.3.1 # Pinned to unbreak unit tests
 ray==2.5.0 # Pinned until 2.9.3 is verified for Ray tests
 ipython==8.22.2 # Pinned to unbreak TypeAliasType import error
 google-vizier==0.1.21
-google-adk==0.0.2
\ No newline at end of file
+google-adk==0.0.2
+pyarrow<26.0.0 # 26.0.0 needs NumPy 2 at import; tensorflow 2.14 keeps NumPy 1.x on Python 3.11