diff --git a/packages/bigframes/testing/constraints-3.11.txt b/packages/bigframes/testing/constraints-3.11.txt
index 7bb201d16fcd..32733aa02ed5 100644
--- a/packages/bigframes/testing/constraints-3.11.txt
+++ b/packages/bigframes/testing/constraints-3.11.txt
@@ -269,7 +269,7 @@ langchain==0.3.27
 langchain-core==0.3.72
 langchain-text-splitters==0.3.9
 langcodes==3.5.0
-langsmith==0.8.0
+langsmith==0.8.18
 language_data==1.3.0
 launchpadlib==1.10.16
 lazr.restfulclient==0.14.4