diff --git a/Documentation/RelNotes/2.55.0.adoc b/Documentation/RelNotes/2.55.0.adoc
index b2adfe5..37f7a61 100644
--- a/Documentation/RelNotes/2.55.0.adoc
+++ b/Documentation/RelNotes/2.55.0.adoc
@@ -204,6 +204,10 @@
    rewritten to use the right repository structure instance in the
    unpack-trees.c codepath.
 
+ * "git index-pack" has been optimized by retaining child bases in the
+   delta cache instead of immediately freeing them, letting the existing
+   cache limit policy decide eviction.
+
 
 Fixes since v2.54
 -----------------
@@ -409,3 +413,4 @@
    (merge 83e7f3bd2b kh/free-commit-list later to maint).
    (merge d1b72b29e9 am/doc-tech-hash-typofix later to maint).
    (merge 014c454799 ak/typofixes later to maint).
+   (merge 522ea8ef7d js/osxkeychain-build-wo-rust later to maint).
diff --git a/GIT-VERSION-GEN b/GIT-VERSION-GEN
index 9448079..9bcfdb5 100755
--- a/GIT-VERSION-GEN
+++ b/GIT-VERSION-GEN
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-DEF_VER=v2.55.0-rc0
+DEF_VER=v2.55.0-rc1
 
 LF='
 '