diff --git a/configure.ac b/configure.ac
index d60610a2..4f875e95 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,9 +29,9 @@ LT_INIT([win32-dll])
 # * Otherwise, increment LT_REVISION
 
 # LT = libtool
-LT_CURRENT=21
-LT_AGE=0
-LT_REVISION=2
+LT_CURRENT=22
+LT_AGE=1
+LT_REVISION=0
 AC_SUBST(LT_CURRENT)
 AC_SUBST(LT_REVISION)
 AC_SUBST(LT_AGE)