diff --git a/CMakeLists.txt b/CMakeLists.txt
index e86ab95..18190f6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,9 +42,9 @@
 # passed to libtool.
 #
 # We set SO_FILE_VERSION = [c-a].a.r
-set(LT_CURRENT 3)
+set(LT_CURRENT 4)
 set(LT_REVISION 0)
-set(LT_AGE 0)
+set(LT_AGE 1)
 math(EXPR SO_VERSION "${LT_CURRENT} - ${LT_AGE}")
 set(SO_FILE_VERSION "${SO_VERSION}.${LT_AGE}.${LT_REVISION}")
 unset(LT_CURRENT)