diff --git a/reana_workflow_engine_cwl/version.py b/reana_workflow_engine_cwl/version.py
index 030411d..44704d1 100644
--- a/reana_workflow_engine_cwl/version.py
+++ b/reana_workflow_engine_cwl/version.py
@@ -14,4 +14,4 @@
 
 from __future__ import absolute_import, print_function
 
-__version__ = "0.9.1"
+__version__ = "0.99.0a1"