diff --git a/pyproject.toml b/pyproject.toml
index b5ddbda..f574c47 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ module-root = ""
 [project]
 name = "optype"
 description = "Building Blocks for Precise & Flexible Type Hints"
-version = "0.15.0"
+version = "0.15.1.dev0"
 authors = [{ name = "Joren Hammudoglu", email = "jhammudoglu@gmail.com" }]
 license = "BSD-3-Clause"
 license-files = ["LICENSE"]
diff --git a/uv.lock b/uv.lock
index 5bc3c1e..b29f456 100644
--- a/uv.lock
+++ b/uv.lock
@@ -313,7 +313,7 @@ wheels = [
 
 [[package]]
 name = "optype"
-version = "0.15.0"
+version = "0.15.1.dev0"
 source = { editable = "." }
 dependencies = [
     { name = "typing-extensions", marker = "python_full_version < '3.13'" },