diff --git a/project/previous-versions.txt b/project/previous-versions.txt
index 67b3e01e07..4b49e2447e 100644
--- a/project/previous-versions.txt
+++ b/project/previous-versions.txt
@@ -4,3 +4,4 @@
 6.3.0
 6.4.0
 6.5.0
+6.6.0