diff --git a/CMakeLists.txt b/CMakeLists.txt
index 28748e604..3da472158 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,7 +2,7 @@
 cmake_minimum_required(VERSION 3.4)
 
 set(CMAKE_USER_MAKE_RULES_OVERRIDE_CXX "${CMAKE_CURRENT_SOURCE_DIR}/cmake/cxx_compiler_flags_overrides.cmake")
-project(Z3 VERSION 4.9.0.0 LANGUAGES CXX)
+project(Z3 VERSION 4.9.1.0 LANGUAGES CXX)
 
 ################################################################################
 # Project version
diff --git a/scripts/mk_project.py b/scripts/mk_project.py
index cb3f1df53..fb8894231 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, 9, 0, 0)
+    set_version(4, 9, 1, 0)
     
 # Z3 Project definition
 def init_project_def():
diff --git a/scripts/nightly.yaml b/scripts/nightly.yaml
index b4582670c..69e8100c0 100644
--- a/scripts/nightly.yaml
+++ b/scripts/nightly.yaml
@@ -2,7 +2,7 @@ variables:
 
   Major: '4'
   Minor: '9'
-  Patch: '0'
+  Patch: '1'
   NightlyVersion: $(Major).$(Minor).$(Patch).$(Build.BuildId)-$(Build.DefinitionName)
 
 stages:
diff --git a/scripts/release.yml b/scripts/release.yml
index 1e4b4002e..71daee2c8 100644
--- a/scripts/release.yml
+++ b/scripts/release.yml
@@ -6,7 +6,7 @@
 trigger: none
 
 variables:
-  ReleaseVersion: '4.9.0'
+  ReleaseVersion: '4.9.1'
 
 stages: