diff --git a/dmq-node/changelog.d/20260629_134054_coot_payload_lower_bound.md b/dmq-node/changelog.d/20260629_134054_coot_payload_lower_bound.md
new file mode 100644
index 0000000..97a5f7e
--- /dev/null
+++ b/dmq-node/changelog.d/20260629_134054_coot_payload_lower_bound.md
@@ -0,0 +1,23 @@
+<!--
+A new scriv changelog fragment.
+
+Uncomment the section that is right (remove the HTML comment wrapper).
+For top level release notes, leave all the headers commented out.
+-->
+
+### Breaking
+
+- Lower `minSigBodySize` to `90` bytes.
+
+<!--
+### Non-Breaking
+
+- A bullet item for the Non-Breaking category.
+
+-->
+<!--
+### Patch
+
+- A bullet item for the Patch category.
+
+-->
diff --git a/dmq-node/src/DMQ/Policy.hs b/dmq-node/src/DMQ/Policy.hs
index 11d4298..459b8af 100644
--- a/dmq-node/src/DMQ/Policy.hs
+++ b/dmq-node/src/DMQ/Policy.hs
@@ -34,7 +34,7 @@ maxSigSize = 2800
 --
 -- See: https://cips.cardano.org/cip/CIP-0137#mithril-extra-network-usage
 minSigBodySize :: SizeInBytes
-minSigBodySize = 360
+minSigBodySize = 90
 
 -- | Maximum `sigBody` size, it must be smaller than `maxSigSize`.
 --