diff --git a/configure.ac b/configure.ac
index 55498f49..592c206e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -28,9 +28,9 @@ AC_CONFIG_HEADERS([MHD_config.h])
 AC_CONFIG_MACRO_DIR([m4])
 AH_TOP([#define _GNU_SOURCE  1])
 
-LIB_VERSION_CURRENT=38
+LIB_VERSION_CURRENT=39
 LIB_VERSION_REVISION=0
-LIB_VERSION_AGE=28
+LIB_VERSION_AGE=29
 AC_SUBST(LIB_VERSION_CURRENT)
 AC_SUBST(LIB_VERSION_REVISION)
 AC_SUBST(LIB_VERSION_AGE)