diff --git a/src/ripple/protocol/impl/BuildInfo.cpp b/src/ripple/protocol/impl/BuildInfo.cpp
index 6cd3668dde5..fc32e65c4ca 100644
--- a/src/ripple/protocol/impl/BuildInfo.cpp
+++ b/src/ripple/protocol/impl/BuildInfo.cpp
@@ -33,7 +33,7 @@ namespace BuildInfo {
 //  and follow the format described at http://semver.org/
 //------------------------------------------------------------------------------
 // clang-format off
-char const* const versionString = "1.9.0"
+char const* const versionString = "1.9.1-b1"
 // clang-format on
 
 #if defined(DEBUG) || defined(SANITIZER)