diff --git a/Doxyfile b/Doxyfile
index 8c889c8..463c684 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = WebSocket++
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 0.8.0
+PROJECT_NUMBER         = 0.9.x-dev
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/readme.md b/readme.md
index 5a05a19..8be503d 100644
--- a/readme.md
+++ b/readme.md
@@ -1,4 +1,4 @@
-WebSocket++ (0.8.0)
+WebSocket++ (0.9.0-dev)
 ==========================
 
 WebSocket++ is a header only C++ library that implements RFC6455 The WebSocket
diff --git a/websocketpp/version.hpp b/websocketpp/version.hpp
index a6c7a7c..bf1ae55 100644
--- a/websocketpp/version.hpp
+++ b/websocketpp/version.hpp
@@ -51,10 +51,10 @@ static int const patch_version = 0;
  * versions (dev, alpha, beta, rc). This will be blank for release versions.
  */
 
-static char const prerelease_flag[] = "";
+static char const prerelease_flag[] = "dev";
 
 /// Default user agent string
-static char const user_agent[] = "WebSocket++/0.8.0";
+static char const user_agent[] = "WebSocket++/0.9.0-dev";
 
 } // namespace websocketpp