diff --git a/pyproject.toml b/pyproject.toml
index 21de80e..77e8aeb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "fessctl"
-version = "0.3.0"
+version = "0.4.0.dev0"
 description = "CLI tool to manage Fess using the admin API"
 readme = "README.md"
 license = "Apache-2.0"
diff --git a/uv.lock b/uv.lock
index 154b63d..cba094a 100644
--- a/uv.lock
+++ b/uv.lock
@@ -102,7 +102,7 @@ wheels = [
 
 [[package]]
 name = "fessctl"
-version = "0.3.0"
+version = "0.4.0.dev0"
 source = { editable = "." }
 dependencies = [
     { name = "httpx" },