diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
index 45ec6148a..33b5c5e5e 100755
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorServer_defs.h
@@ -4,7 +4,7 @@
 
 
 #define MIN_REQRD_VRSN_T_RD_API     0x181130
-#define REQRD_FRMWR_VRSN            0x190402
+#define REQRD_FRMWR_VRSN            0x190821
 
 #define CTRL_SRVR_INIT_TIME_US      (2 * 1000 * 1000)