:art: Improve mpool

diff --git a/util b/util
index 0227dde4c8e0ff2c80f816833a5e818cd1219b58..2e1ef68c6cf1886132cdd0f2351c8155d8a75fc2 160000 (submodule)
--- a/util
+++ b/util
@@ -1 +1 @@
-Subproject commit 0227dde4c8e0ff2c80f816833a5e818cd1219b58
+Subproject commit 2e1ef68c6cf1886132cdd0f2351c8155d8a75fc2