diff --git a/src/result/__init__.py b/src/result/__init__.py
index 470dc0c..93cdcc9 100644
--- a/src/result/__init__.py
+++ b/src/result/__init__.py
@@ -25,4 +25,4 @@
     "do",
     "do_async",
 ]
-__version__ = "0.17.0"
+__version__ = "0.18.0.dev0"