diff --git a/VERSION b/VERSION
index ccbccc3..84e6d84 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.2.0
+2.2.1-dev
diff --git a/python/adapters/ponsim_olt/VERSION b/python/adapters/ponsim_olt/VERSION
index ccbccc3..84e6d84 100644
--- a/python/adapters/ponsim_olt/VERSION
+++ b/python/adapters/ponsim_olt/VERSION
@@ -1 +1 @@
-2.2.0
+2.2.1-dev
diff --git a/python/adapters/ponsim_onu/VERSION b/python/adapters/ponsim_onu/VERSION
index ccbccc3..84e6d84 100644
--- a/python/adapters/ponsim_onu/VERSION
+++ b/python/adapters/ponsim_onu/VERSION
@@ -1 +1 @@
-2.2.0
+2.2.1-dev