diff --git a/configure.ac b/configure.ac
index 6f98b6a..f312052 100644
--- a/configure.ac
+++ b/configure.ac
@@ -15,7 +15,7 @@
 #                 changes to the signature and the semantic)
 #  ? :+1 : ?   == just internal changes
 # CURRENT : REVISION : AGE
-LIBUSBMUXD_SO_VERSION=3:1:1
+LIBUSBMUXD_SO_VERSION=4:0:0
 
 AC_SUBST(LIBUSBMUXD_SO_VERSION)