diff --git a/ChangeLog b/ChangeLog
index 9250127542..e3e1630123 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,4 +1,4 @@
-### 3.9.1dev <- NOTE: the release version number will be 3.10.0 ###
+### 3.9.1nightly1 <- NOTE: the release version number will be 3.10.0 ###
 
 - Mac: The legacy build now uses the macOS 13.1 SDK which is unsupported by Qt 5.9.9. We still provide the legacy build, but from now on consider it as deprecated. You are advised to upgrade your OS (#3066).
   (contributed by @ann0see)
diff --git a/Jamulus.pro b/Jamulus.pro
index ebaac64a35..b6ffb0745a 100644
--- a/Jamulus.pro
+++ b/Jamulus.pro
@@ -1,4 +1,4 @@
-VERSION = 3.9.1dev
+VERSION = 3.9.1nightly1
 
 # use target name which does not use a capital letter at the beginning
 contains(CONFIG, "noupcasename") {