diff --git a/CITATION.cff b/CITATION.cff
index 3cbbbb485..780993703 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -4,7 +4,7 @@ message: >-
   If you use this software, please cite it using the
   metadata from this file.
 type: software
-version: 4.9.1
+version: 4.10.0-alpha
 doi: "10.5281/zenodo.3381141"
 repository-code: "https://github.com/Edirom/WeGA-WebApp"
 license:
diff --git a/build.properties b/build.properties
index 218218a92..eebfa5010 100644
--- a/build.properties
+++ b/build.properties
@@ -4,7 +4,7 @@
 #
 project.app=WeGA-WebApp
 project.name=http://weber-gesamtausgabe.de/webapp
-project.version=4.9.1
+project.version=4.10.0-alpha
 build.dir=build
 dist.dir=dist
 tmp.dir=tmp
diff --git a/package.json b/package.json
index 70bc8728c..525fd4fc1 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "WeGA-WebApp",
-  "version": "4.9.1",
+  "version": "4.10.0-alpha",
   "description": "Web application for the digital edition of the Carl Maria von Weber Collected Works",
   "main": "controller.xql",
   "repository": "https://github.com/Edirom/WeGA-WebApp.git",