diff --git a/python/travel-adk-ai-agent/requirements.txt b/python/travel-adk-ai-agent/requirements.txt
index cc359d92..3c2f5ec6 100644
--- a/python/travel-adk-ai-agent/requirements.txt
+++ b/python/travel-adk-ai-agent/requirements.txt
@@ -6,5 +6,5 @@ google-api-core==2.25.1
 PyJWT==2.10.1
 google-apps-chat==0.4.0
 google-cloud-aiplatform[adk,agent-engines]==1.118.0
-google-adk==1.15.1
+google-adk==1.28.1
 markdown==3.9