diff --git a/Project.toml b/Project.toml
index 86e13593..61d9d365 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "HierarchicalEOM"
 uuid = "a62dbcb7-80f5-4d31-9a88-8b19fd92b128"
 authors = ["Yi-Te Huang <y.t.d.huang@phys.ncku.edu.tw>"]
-version = "2.2.1"
+version = "2.2.2"
 
 [deps]
 DiffEqCallbacks = "459566f4-90b8-5000-8ac3-15dfb0a30def"