diff --git a/frontend/package.json b/frontend/package.json
index 14001aa4..a116d302 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "plombery",
-  "version": "0.3.2",
+  "version": "0.4.0.rc1",
   "description": "",
   "license": "MIT",
   "author": {
diff --git a/src/plombery/_version.py b/src/plombery/_version.py
index 2ff19694..b0d3c610 100644
--- a/src/plombery/_version.py
+++ b/src/plombery/_version.py
@@ -1,3 +1,3 @@
 # Keep it aligned with version in package.json
 
-__version__ = "0.3.2"
+__version__ = "0.4.0.rc1"