diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 762c7cd..48ce281 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,12 +1,15 @@
 Changelog
 ==============
 
-5.0.2 (unreleased)
+6.0.0 (unreleased)
 ------------------
-
+- MOST IMPORTANT & NON RETROCOMPATIBLE CHANGES:
+    - Use ZoneInfo on py39+ [kiorky]
+- Fix EPOCH calculation in case of non UTC & 32 bits based systems [kiorky]
 - Apply isort formatter [kiorky]
+- Reintegrate test_speed [kiorky]
 - Apply black formatter [evanpurkhiser, kiorky]
-- Code quality changes by evanpurkhiser:
+- Code quality changes [evanpurkhiser, kiorky]
     - Remove unused _get_caller_globals_and_locals [evanpurkhiser]
     - Remove single-use bad_length [evanpurkhiser]
     - Remove unused `days` in `proc_month` [evanpurkhiser]
diff --git a/setup.py b/setup.py
index 066e8b3..eee99f3 100644
--- a/setup.py
+++ b/setup.py
@@ -24,7 +24,7 @@ def read(*rnames):
 
 setup(
     name='croniter',
-    version='5.0.2.dev0',
+    version='6.0.0.dev0',
     py_modules=['croniter', ],
     description=(
         'croniter provides iteration for datetime '