diff --git a/src/tss.c b/src/tss.c
index e9d68f39..80591e7f 100644
--- a/src/tss.c
+++ b/src/tss.c
@@ -35,7 +35,7 @@
 
 #include "endianness.h"
 
-#define AUTH_VERSION "914.120.2"
+#define AUTH_VERSION "973.40.2"
 
 #ifdef WIN32
 #define TSS_CLIENT_VERSION_STRING "libauthinstall_Win-"AUTH_VERSION""