diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3bbc37feb..32a6127f3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,11 +18,11 @@ if(CMAKE_C_COMPILER_ID STREQUAL "AppleClang" AND CMAKE_C_COMPILER_VERSION VERSIO
     message(FATAL_ERROR "${PROJECT_NAME} requires at least apple-clang version 11 to support runtime dispatching.")
 endif()
 set(ROARING_LIB_NAME roaring)
-set(PROJECT_VERSION_MAJOR 3)
+set(PROJECT_VERSION_MAJOR 4)
 set(PROJECT_VERSION_MINOR 0)
-set(PROJECT_VERSION_PATCH 1)
-set(ROARING_LIB_VERSION "3.0.1" CACHE STRING "Roaring library version")
-set(ROARING_LIB_SOVERSION "15" CACHE STRING "Roaring library soversion")
+set(PROJECT_VERSION_PATCH 0)
+set(ROARING_LIB_VERSION "4.0.0" CACHE STRING "Roaring library version")
+set(ROARING_LIB_SOVERSION "16" CACHE STRING "Roaring library soversion")
 
 option(ROARING_EXCEPTIONS "Enable exception-throwing interface" ON)
 if(NOT ROARING_EXCEPTIONS)
diff --git a/doxygen b/doxygen
index df816a93c..446212313 100644
--- a/doxygen
+++ b/doxygen
@@ -48,7 +48,7 @@ PROJECT_NAME           = "CRoaring"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = "3.0.1"
+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/include/roaring/roaring_version.h b/include/roaring/roaring_version.h
index da2a044f0..719630048 100644
--- a/include/roaring/roaring_version.h
+++ b/include/roaring/roaring_version.h
@@ -2,11 +2,11 @@
 // /include/roaring/roaring_version.h automatically generated by release.py, do not change by hand
 #ifndef ROARING_INCLUDE_ROARING_VERSION
 #define ROARING_INCLUDE_ROARING_VERSION
-#define ROARING_VERSION "3.0.1"
+#define ROARING_VERSION "4.0.0"
 enum {
-    ROARING_VERSION_MAJOR = 3,
+    ROARING_VERSION_MAJOR = 4,
     ROARING_VERSION_MINOR = 0,
-    ROARING_VERSION_REVISION = 1
+    ROARING_VERSION_REVISION = 0
 };
 #endif // ROARING_INCLUDE_ROARING_VERSION
 // clang-format on
\ No newline at end of file