diff --git a/src/Makefile b/src/Makefile
index ffa1083..52d3327 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -6,7 +6,7 @@ include $(TOP)/configure/CONFIG
 LIBRARY += pvaClient
 
 # shared library ABI version.
-SHRLIB_VERSION ?= 4.2.0
+SHRLIB_VERSION ?= 4.3.0
 
 INC += pv/pvaClient.h
 INC += pv/pvaClientMultiChannel.h