diff --git a/VERSION.txt b/VERSION.txt
index 1b58cc10..e7556aad 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-0.27.0
+0.28.dev0
diff --git a/owslib/__init__.py b/owslib/__init__.py
index cf7b6d65..2a02f20d 100644
--- a/owslib/__init__.py
+++ b/owslib/__init__.py
@@ -1 +1 @@
-__version__ = '0.27.0'
+__version__ = '0.28.dev0'