diff --git a/docs/openapi.json b/docs/openapi.json
index 181690c0..15ea06ef 100644
--- a/docs/openapi.json
+++ b/docs/openapi.json
@@ -122,7 +122,7 @@
   "info": {
     "description": "REANA Job Controller API",
     "title": "reana-job-controller",
-    "version": "0.9.1"
+    "version": "0.99.0a1"
   },
   "paths": {
     "/apispec": {},
diff --git a/reana_job_controller/version.py b/reana_job_controller/version.py
index 95bab044..4c051412 100644
--- a/reana_job_controller/version.py
+++ b/reana_job_controller/version.py
@@ -14,4 +14,4 @@
 
 from __future__ import absolute_import, print_function
 
-__version__ = "0.9.1"
+__version__ = "0.99.0a1"