diff --git a/solanaceae/util/config_model.hpp b/solanaceae/util/config_model.hpp
index 11d4a46..bc55894 100644
--- a/solanaceae/util/config_model.hpp
+++ b/solanaceae/util/config_model.hpp
@@ -6,6 +6,8 @@
 
 // TODO: events?
 struct ConfigModelI {
+	static constexpr const char* version {"2"};
+
 	~ConfigModelI(void) {}
 
 	// interface