diff --git a/Tools/msi/uuids.py b/Tools/msi/uuids.py
index 2261178..895498f 100644
--- a/Tools/msi/uuids.py
+++ b/Tools/msi/uuids.py
@@ -58,4 +58,6 @@
     '2.6.5121':'{e0e273d7-7598-4701-8325-c90c069fd5ff}', # 2.6.5c1
     '2.6.5122':'{fa227b76-0671-4dc6-b826-c2ff2a70dfd5}', # 2.6.5c2
     '2.6.5150':'{4723f199-fa64-4233-8e6e-9fccc95a18ee}', # 2.6.5
+    '2.6.6121':'{399b7502-8119-4400-9218-4906194fedf5}', # 2.6.6rc1
+    '2.6.6150':'{6151cf20-0bd8-4023-a4a0-6a86dcfe58e5}', # 2.6.6
 }