diff --git a/version.h b/version.h
index 9a07a05..6c59fa3 100644
--- a/version.h
+++ b/version.h
@@ -1,4 +1,4 @@
 #ifndef VERSION_H
 #define VERSION_H
-const char *fdkaac_version = "0.3.3";
+const char *fdkaac_version = "0.4.0";
 #endif