diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index da542333..bfe7cc5 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -338,6 +338,7 @@
   QUIC_VERSION_24 = 24,  // SPDY/4 header compression.
   QUIC_VERSION_25 = 25,  // SPDY/4 header keys, and removal of error_details
                          // from QuicRstStreamFrame
+  QUIC_VERSION_26 = 26,  // In CHLO, send XLCT tag containing hash of leaf cert
 };
 
 // This vector contains QUIC versions which we currently support.
@@ -347,8 +348,8 @@
 //
 // IMPORTANT: if you are adding to this list, follow the instructions at
 // http://sites/quic/adding-and-removing-versions
-static const QuicVersion kSupportedQuicVersions[] = {QUIC_VERSION_25,
-                                                     QUIC_VERSION_24};
+static const QuicVersion kSupportedQuicVersions[] = {
+    QUIC_VERSION_26, QUIC_VERSION_25, QUIC_VERSION_24};
 
 typedef std::vector<QuicVersion> QuicVersionVector;