diff --git a/src/libosmo-mgcp-client/Makefile.am b/src/libosmo-mgcp-client/Makefile.am
index 1529853..8f5513a 100644
--- a/src/libosmo-mgcp-client/Makefile.am
+++ b/src/libosmo-mgcp-client/Makefile.am
@@ -20,7 +20,7 @@
 
 # This is not at all related to the release version, but a range of supported
 # API versions. Read TODO_RELEASE in the source tree's root!
-MGCP_CLIENT_LIBVERSION=5:0:0
+MGCP_CLIENT_LIBVERSION=6:0:0
 
 lib_LTLIBRARIES = \
 	libosmo-mgcp-client.la \