diff --git a/pyproject.toml b/pyproject.toml
index b988cfbf910318ee0b2f73e8aa5dd464eae44d28..a49e42de071a72ca729dbf306e763e305ed2d763 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "AlekSIS-App-Postbuero"
-version = "3.0.dev3"
+version = "3.0.dev4"
 packages = [
     { include = "aleksis" }
 ]
@@ -30,7 +30,7 @@ priority = "supplemental"
 
 [tool.poetry.dependencies]
 python = "^3.10"
-AlekSIS-Core = "4.0.0.dev11"
+AlekSIS-Core = "^4.0.0.dev11"
 
 [tool.poetry.plugins."aleksis.app"]
 postbuero = "aleksis.apps.postbuero.apps:PostBueroConfig"