diff --git a/src/Makefile b/src/Makefile
index c915322..b626bf0 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -18,7 +18,7 @@ LIBRARY = pvData
 pvData_LIBS += Com
 
 # shared library ABI version.
-SHRLIB_VERSION ?= 5.0
+SHRLIB_VERSION ?= 6.0
 
 include $(TOP)/configure/RULES