diff --git a/contributing/samples/authn-adk-all-in-one/adk_agents/requirements.txt b/contributing/samples/authn-adk-all-in-one/adk_agents/requirements.txt
index f490d72da0f..248e6cd503d 100644
--- a/contributing/samples/authn-adk-all-in-one/adk_agents/requirements.txt
+++ b/contributing/samples/authn-adk-all-in-one/adk_agents/requirements.txt
@@ -1 +1 @@
-google-adk==1.12
+google-adk==1.28.1