diff --git a/agent.py b/agent.py
index cb0d1fa..8415591 100644
--- a/agent.py
+++ b/agent.py
@@ -299,4 +299,4 @@ def _build_failure_error(exc: BaseException) -> str:
             "or a smaller build scope"
         )
     return f"build graph failed: {type(exc).__name__}: {exc}"
-# rebuild against a2a-pack 0.1.57 for manifest-backed meta-agent defaults
+# rebuild against a2a-pack 0.1.59 for source-grant-aware agent updates
diff --git a/agent_builder/tools.py b/agent_builder/tools.py
index 003511b..24e5ed9 100644
--- a/agent_builder/tools.py
+++ b/agent_builder/tools.py
@@ -31,7 +31,7 @@ if TYPE_CHECKING:
     from .config import Settings
 
 
-A2A_PACK_MIN_VERSION = "0.1.57"
+A2A_PACK_MIN_VERSION = "0.1.59"
 
 
 @dataclass(frozen=True)
diff --git a/requirements.txt b/requirements.txt
index 9e09dac..55e4cff 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-a2a-pack>=0.1.57
+a2a-pack>=0.1.59
 httpx>=0.27
 boto3>=1.34
 deepagents>=0.5.0