diff --git a/configure.ac b/configure.ac
index f6a8a0d..7aaa433 100644
--- a/configure.ac
+++ b/configure.ac
@@ -19,7 +19,7 @@
 
 AC_PREREQ(2.59)
 
-AC_INIT([thrift], [0.4.0-dev])
+AC_INIT([thrift], [0.5.0-dev])
 
 AC_CONFIG_AUX_DIR([.])