diff --git a/.version.cmake b/.version.cmake
index 773562d..6f48172 100644
--- a/.version.cmake
+++ b/.version.cmake
@@ -1 +1 @@
-set(VERSION 0.5.5.0)
\ No newline at end of file
+set(VERSION 0.5.7.0)
\ No newline at end of file
diff --git a/CHANGELOG b/CHANGELOG
index 653c70a..c0de17e 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -6,6 +6,7 @@
   - ticker - removed and released as ticker-cxx standalone
   - and more (undo, fsm, ...)
 
+- v0.5.7 - fixed all builds on c++20 (unused param; ambiguous operator << for time_point/duration; ...)
 - v0.5.5 - fixed importing cmdr11(-cxx) via cmake ExternalProject_Add
 - v0.5.3 - fixed upload-artifact in last release
 - v0.5.2 - fixed upload/download-artifact in last release; compliant with c++20 or higher
diff --git a/README.md b/README.md
index fb9bf95..8356b5c 100644
--- a/README.md
+++ b/README.md
@@ -86,6 +86,7 @@ See also golang version: [cmdr](https://github.com/hedzr/cmdr).
 
 ## Status
 
+- v0.5.7 - fixed all builds on c++20 (unused param; ambiguous operator << for time_point/duration; ...)
 - v0.5.5 - fixed importing cmdr11(-cxx) via cmake ExternalProject_Add
 - v0.5.3 - fixed upload-artifact in last release
   > actions/upload-artifact and download-artifact must be same major version (such as v4, both)