diff --git a/include/asio2/version.hpp b/include/asio2/version.hpp
index dab3bfc0..92442c40 100644
--- a/include/asio2/version.hpp
+++ b/include/asio2/version.hpp
@@ -26,7 +26,7 @@
 
 // ASIO2_VERSION / 100 is the major version
 // ASIO2_VERSION % 100 is the minor version
-#define ASIO2_VERSION 208 // 2.8
+#define ASIO2_VERSION 209 // 2.9