diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4830acb..0d6a8c2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 0.7.0a6 (2026-06-11)
+
+### Feat
+
+- allow undefined option
+
 ## 0.7.0a5 (2025-12-30)
 
 ## 0.7.0a4 (2025-11-21)
diff --git a/pyproject.toml b/pyproject.toml
index ca4e4fe..03569a4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ requires = ["flit_core >=3.8.0,<4"]
 
 [project]
 name = "tiramisu_cmdline_parser"
-version = "0.7.0a5"
+version = "0.7.0a6"
 authors = [{name = "Emmanuel Garette", email = "gnunux@gnunux.info"}]
 readme = "README.md"
 description = "command-line parser using Tiramisu"
diff --git a/tiramisu_cmdline_parser/__version__.py b/tiramisu_cmdline_parser/__version__.py
index 7131288..1be6ce6 100644
--- a/tiramisu_cmdline_parser/__version__.py
+++ b/tiramisu_cmdline_parser/__version__.py
@@ -1 +1 @@
-__version__ = "0.7.0a5"
+__version__ = "0.7.0a6"