diff --git a/.changeset/tall-shirts-accept.md b/.changeset/tall-shirts-accept.md
new file mode 100644
index 0000000000..7725991645
--- /dev/null
+++ b/.changeset/tall-shirts-accept.md
@@ -0,0 +1,7 @@
+---
+'@hyperlane-xyz/infra': patch
+'@hyperlane-xyz/cli': patch
+'@hyperlane-xyz/sdk': patch
+---
+
+Removing agentStartBlocks and using mailbox.deployedBlock() instead