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 f490d72da0..248e6cd503 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
diff --git a/contributing/samples/authn-adk-all-in-one/requirements.txt b/contributing/samples/authn-adk-all-in-one/requirements.txt
index 777d8d52bb..39a92064bb 100644
--- a/contributing/samples/authn-adk-all-in-one/requirements.txt
+++ b/contributing/samples/authn-adk-all-in-one/requirements.txt
@@ -1,4 +1,4 @@
-google-adk==1.12
+google-adk==1.28.1
 Flask==3.1.3
 flask-cors==6.0.1
 python-dotenv==1.1.1