diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9ed53d2..98d4c55 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -17,8 +17,8 @@ include(GNUInstallDirs)
 ################################
 # set lib version here
 
-set(GENERIC_LIB_VERSION "3.0.0")
-set(GENERIC_LIB_SOVERSION "3")
+set(GENERIC_LIB_VERSION "4.0.0")
+set(GENERIC_LIB_SOVERSION "4")
 
 
 ################################
diff --git a/dox b/dox
index 7c3cd78..5ae0b21 100644
--- a/dox
+++ b/dox
@@ -38,7 +38,7 @@ PROJECT_NAME           = "TinyXML-2"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER = 3.0.0
+PROJECT_NUMBER = 4.0.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/tinyxml2.h b/tinyxml2.h
index 410faa2..9dcc345 100755
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -96,7 +96,7 @@ distribution.
 /* Versioning, past 1.0.14:
 	http://semver.org/
 */
-static const int TIXML2_MAJOR_VERSION = 3;
+static const int TIXML2_MAJOR_VERSION = 4;
 static const int TIXML2_MINOR_VERSION = 0;
 static const int TIXML2_PATCH_VERSION = 0;