diff --git a/go.mod b/go.mod
index 2e7c692..f4ea04f 100644
--- a/go.mod
+++ b/go.mod
@@ -11,7 +11,7 @@ require (
 	github.com/muesli/termenv v0.16.0
 	golang.org/x/net v0.55.0
 	golang.org/x/term v0.43.0
-	google.golang.org/adk v1.2.1-0.20260519122726-f2aee5301649
+	google.golang.org/adk v1.4.0
 	google.golang.org/genai v1.57.0
 	gopkg.in/yaml.v3 v3.0.1
 )
diff --git a/go.sum b/go.sum
index 30b57e1..3230245 100644
--- a/go.sum
+++ b/go.sum
@@ -189,8 +189,8 @@ golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gonum.org/v1/gonum v0.17.0 h1:VbpOemQlsSMrYmn7T2OUvQ4dqxQXU+ouZFQsZOx50z4=
 gonum.org/v1/gonum v0.17.0/go.mod h1:El3tOrEuMpv2UdMrbNlKEh9vd86bmQ6vqIcDwxEOc1E=
-google.golang.org/adk v1.2.1-0.20260519122726-f2aee5301649 h1:jQQ81gyy7j6Mh2gE9YIJMLFQMCFwLZbcLj66Fj6nLfM=
-google.golang.org/adk v1.2.1-0.20260519122726-f2aee5301649/go.mod h1:R8tNFnI/eiBXHn7zJPJtqdiK/WXC+tVkyuZsXyNZXN4=
+google.golang.org/adk v1.4.0 h1:Qi4KB9YKD00/I5K9v3QsZ9ng5YiZQ7MfMgM8BZjNcsM=
+google.golang.org/adk v1.4.0/go.mod h1:R8tNFnI/eiBXHn7zJPJtqdiK/WXC+tVkyuZsXyNZXN4=
 google.golang.org/api v0.279.0 h1:hsx2M2OaRcaKtVYK6vXEUnQvdjnend7ZYES+lYaot74=
 google.golang.org/api v0.279.0/go.mod h1:B9TqLBwJqVjp1mtt7WeoQwWRwvu/400y5lETOql+giQ=
 google.golang.org/genai v1.57.0 h1:qTyG2ynz5dQy2jF4CvZdLHHVslhR0heMue+zM1a4GNM=