diff -r 8acf182f6424 -r b9715d7317c1 configure.ac
--- a/configure.ac	Fri Jul 05 15:47:57 2019 +0200
+++ b/configure.ac	Thu Jul 11 10:11:43 2019 +0200
@@ -29,7 +29,7 @@
 # the package version must match the macros in ucx.h
 # the lib version must follow the libtool versioning convention
 AC_INIT([ucx], [2.1.0], [olaf.wintermann@gmail.com])
-AC_SUBST([UCX_LIB_VERSION], [4:1:1])
+AC_SUBST([UCX_LIB_VERSION], [4:0:1])
 
 # don't place everything in the project root
 AC_CONFIG_AUX_DIR([build-aux])