diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 2f4ae6d0..ae5b106b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -324,8 +324,8 @@ add_library(libavrdude
 set_target_properties(libavrdude PROPERTIES
     PREFIX ""
     PUBLIC_HEADER "libavrdude.h;libavrdude-avrintel.h"
-    VERSION 3.0.0
-    SOVERSION 3
+    VERSION 4.0.0
+    SOVERSION 4
     )
 
 target_include_directories(libavrdude