diff --git a/docs/conf.py b/docs/conf.py
index cd47fa5c9038120f47dea3ec18a4850273f55ea4..ace9cb6f5fde3d197c2acdfe4c577900c10ab5c9 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@ copyright = '2021 Dronehub Group sp. z o. o., 2024 SMOK sp. z o. o.'
 author = 'Piotr Maślanka'
 
 # The full version, including alpha/beta/rc tags
-release = '3.1.0'
+release = '3.1.1a1'
 
 
 # -- General configuration ---------------------------------------------------
diff --git a/setup.cfg b/setup.cfg
index 83813215fc8e49c9988f07f8c6e8a06cb10a5116..ca2d9fb92d05248e5dad5ffe6c9f191a56f988c0 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,6 +1,6 @@
 # coding: utf-8
 [metadata]
-version = 3.1.0
+version = 3.1.1a1
 name = minijson
 long_description = file: README.md
 long_description_content_type = text/markdown; charset=UTF-8