diff --git a/package-lock.json b/package-lock.json
index 74beca11..33609b96 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@tmtsoftware/esw-ts",
-  "version": "0.4.0",
+  "version": "0.4.1-RC1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@tmtsoftware/esw-ts",
-      "version": "0.4.0",
+      "version": "0.4.1-RC1",
       "license": "ISC",
       "dependencies": {
         "fp-ts": "^2.11.8",