diff --git a/configure.ac b/configure.ac
index 8fde999d1..4c3176a60 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,6 +1,6 @@
-AC_INIT([Transmission],[0.80+],[http://transmission.m0k.org/trac/newticket])
-PEERID_PREFIX="-TR080Z-"
-USERAGENT_PREFIX="0.80+"
+AC_INIT([Transmission],[0.81+],[http://transmission.m0k.org/trac/newticket])
+PEERID_PREFIX="-TR081Z-"
+USERAGENT_PREFIX="0.81+"
 
 AC_PREREQ(2.54)
 dnl AM_CONFIG_HEADER(config.h)