diff --git a/ChangeLog b/ChangeLog
index a9eccd885..18f2c1607 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,7 +3,7 @@ astroid's ChangeLog
 ===================
 
 
-What's New in astroid 3.4.0?
+What's New in astroid 4.0.0?
 ============================
 Release date: TBA
 
@@ -13,17 +13,6 @@ What's New in astroid 3.3.5?
 ============================
 Release date: TBA
 
-* Fix regression with f-string inference.
-
-  Closes pylint-dev/pylint#9947
-
-* Fix bug with ``manager.clear_cache()`` not fully clearing cache
-
-  Refs https://github.com/pylint-dev/pylint/pull/9932#issuecomment-2364985551
-
-* Fix a crash from inferring empty format specs.
-
-  Closes pylint-dev/pylint#9945
 
 
 What's New in astroid 3.3.4?
@@ -34,7 +23,7 @@ Release date: 2024-09-23
 
   Closes pylint-dev/pylint#9947
 
-* Fix bug with ``manager.clear_cache()`` not fully clearing cache
+* Fix bug with ``manager.clear_cache()`` not fully clearing cache.
 
   Refs https://github.com/pylint-dev/pylint/pull/9932#issuecomment-2364985551
 
diff --git a/astroid/__pkginfo__.py b/astroid/__pkginfo__.py
index 670742907..18f0d9b19 100644
--- a/astroid/__pkginfo__.py
+++ b/astroid/__pkginfo__.py
@@ -2,5 +2,5 @@
 # For details: https://github.com/pylint-dev/astroid/blob/main/LICENSE
 # Copyright (c) https://github.com/pylint-dev/astroid/blob/main/CONTRIBUTORS.txt
 
-__version__ = "3.4.0-dev0"
+__version__ = "4.0.0-dev0"
 version = __version__
diff --git a/tbump.toml b/tbump.toml
index 2001b94c7..0c98eaefb 100644
--- a/tbump.toml
+++ b/tbump.toml
@@ -1,7 +1,7 @@
 github_url = "https://github.com/pylint-dev/astroid"
 
 [version]
-current = "3.4.0-dev0"
+current = "4.0.0-dev0"
 regex = '''
 ^(?P<major>0|[1-9]\d*)
 \.