diff --git a/src/flask/__init__.py b/src/flask/__init__.py
index 463f55f2..4bd52311 100644
--- a/src/flask/__init__.py
+++ b/src/flask/__init__.py
@@ -42,7 +42,7 @@ from .templating import render_template_string as render_template_string
 from .templating import stream_template as stream_template
 from .templating import stream_template_string as stream_template_string
 
-__version__ = "2.2.3"
+__version__ = "2.2.3.dev"
 
 
 def __getattr__(name):