diff --git a/.hgtags b/.hgtags
index a1e6300..40a7259 100644
--- a/.hgtags
+++ b/.hgtags
@@ -466,3 +466,4 @@
 2217a9c1d0b86026f22700b3c089545db1964f55 release-1.21.3
 39be8a682c58308d9399cddd57e37f9fdb7bdf3e release-1.21.4
 d986378168fd4d70e0121cabac274c560cca9bdf release-1.21.5
+714eb4b2c09e712fb2572a2164ce2bf67638ccac release-1.21.6