diff --git a/src/exchange/taler-exchange-httpd_keys.c b/src/exchange/taler-exchange-httpd_keys.c
index ad06b6684..6b5bccdc6 100644
--- a/src/exchange/taler-exchange-httpd_keys.c
+++ b/src/exchange/taler-exchange-httpd_keys.c
@@ -50,7 +50,7 @@
  * #TALER_PROTOCOL_CURRENT and #TALER_PROTOCOL_AGE in
  * exchange_api_handle.c!
  */
-#define EXCHANGE_PROTOCOL_VERSION "9:0:0"
+#define EXCHANGE_PROTOCOL_VERSION "10:0:0"
 
 
 /**