diff --git a/CHANGELOG.md b/CHANGELOG.md
index b0764e54e9a8c5e5d243691ae5f00ee0df17ca49..8a79ce40bbb901b2072b233d3aa8354f654e480a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.6.7
+
+* TBA
+
 ## v0.6.6
 
 * replaced most signed integers with unsigned
diff --git a/docs/conf.py b/docs/conf.py
index 50925f9e906aa25a831b9b847fc06335666edaf7..56b9958d4fea1baa5344df27c391a662bfb06f30 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@ project = 'tempsdb'
 copyright = '2020-2024, Piotr Maślanka'
 author = 'Piotr Maślanka'
 
-release = '0.6.6'
+release = '0.6.7a1'
 
 # -- General configuration ---------------------------------------------------
 
diff --git a/setup.cfg b/setup.cfg
index f5f999eb99106e7e9f1e7ec780e4298f15040ed9..be69dc712e90fd7d3def0a1885c7a9ce8df0fc17 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,7 +1,7 @@
 # coding: utf-8
 [metadata]
 name = tempsdb
-version = 0.6.6
+version = 0.6.7a1
 long_description = file: README.md
 long_description-content-type = text/markdown; charset=UTF-8
 license_files = LICENSE