diff --git a/CMakeLists.txt b/CMakeLists.txt
index 39f89ae74..ba3ec7bce 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 cmake_minimum_required(VERSION 3.16)
 
 set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cxx_compiler_flags_overrides.cmake")
-project(Z3 VERSION 4.12.6.0 LANGUAGES CXX)
+project(Z3 VERSION 4.13.0.0 LANGUAGES CXX)
 
 ################################################################################
 # Project version
diff --git a/scripts/mk_project.py b/scripts/mk_project.py
index 7cc5a0933..d91feea9f 100644
--- a/scripts/mk_project.py
+++ b/scripts/mk_project.py
@@ -8,7 +8,7 @@
 from mk_util import *
 
 def init_version():
-    set_version(4, 12, 6, 0) # express a default build version or pick up ci build version
+    set_version(4, 13, 0, 0) # express a default build version or pick up ci build version
     
 # Z3 Project definition
 def init_project_def():
diff --git a/scripts/nightly.yaml b/scripts/nightly.yaml
index f6c3c66c7..4b9698c14 100644
--- a/scripts/nightly.yaml
+++ b/scripts/nightly.yaml
@@ -1,7 +1,7 @@
 variables:
   Major: '4'
-  Minor: '12'
-  Patch: '6'
+  Minor: '13'
+  Patch: '0'
   ReleaseVersion: $(Major).$(Minor).$(Patch)
   AssemblyVersion: $(Major).$(Minor).$(Patch).$(Build.BuildId)
   NightlyVersion: $(AssemblyVersion)-$(Build.buildId)
diff --git a/scripts/release.yml b/scripts/release.yml
index 7a2c4ef41..083e58aee 100644
--- a/scripts/release.yml
+++ b/scripts/release.yml
@@ -6,7 +6,7 @@
 trigger: none
 
 variables:
-  ReleaseVersion: '4.12.6'
+  ReleaseVersion: '4.13.0'
 
 stages: