diff --git a/include/beast/version.hpp b/include/beast/version.hpp
index 1e682cc6..7ef8b0f7 100644
--- a/include/beast/version.hpp
+++ b/include/beast/version.hpp
@@ -16,6 +16,6 @@
 //
 #define BEAST_VERSION 100000
 
-#define BEAST_VERSION_STRING "1.0.0-b20"
+#define BEAST_VERSION_STRING "1.0.0-b21"
 
 #endif