diff --git a/package-lock.json b/package-lock.json
index 88d60cdef7..e7454d2ae1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "ol",
-  "version": "6.4.0",
+  "version": "6.4.1-dev",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index ad7e890673..68ab2f0163 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ol",
-  "version": "6.4.0",
+  "version": "6.4.1-dev",
   "description": "OpenLayers mapping library",
   "keywords": [
     "map",