diff --git a/.hgtags b/.hgtags
index 6d7a5dea180..2e9ded985eb 100644
--- a/.hgtags
+++ b/.hgtags
@@ -69,3 +69,4 @@ c0abb18299b442e1160d2f958bce18f66850caa9 v2.5b3
 2dc64d570e8d7a4498ab850108c85709c276df93 v2.5c1
 cc3cb3a8237ea545db917d84c49d8a0a5e175cc1 v2.5c2
 c10a71cf16e471425e6d7564e3f7a648f14b702e v2.5
+4777c4007b5b194423953d41b1e5e6adaaba6c5d v2.5.1c1