diff --git a/CHANGES.rst b/CHANGES.rst
index d66e44e..de91e65 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -2,6 +2,12 @@ Changes
 =======
 
 
+1.2.2 (unreleased)
+------------------
+
+- Nothing changed yet.
+
+
 1.2.1 (2022-10-28)
 ------------------
 
diff --git a/strace_process_tree.py b/strace_process_tree.py
index 39d267f..bb99e10 100755
--- a/strace_process_tree.py
+++ b/strace_process_tree.py
@@ -21,7 +21,7 @@
 from functools import partial
 
 
-__version__ = '1.2.1'
+__version__ = '1.2.2.dev0'
 __author__ = 'Marius Gedminas <marius@gedmin.as>'
 __url__ = "https://github.com/mgedmin/strace-process-tree"
 __licence__ = 'GPL v2 or v3'  # or ask me for MIT