diff --git a/glibc.spec b/glibc.spec
index 53a9f5f..71bc29d 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,6 +1,6 @@
-%define glibcsrcdir glibc-2.28.9000-379-g505b5b2922
+%define glibcsrcdir glibc-2.28.9000-391-gade8b817fe
 %define glibcversion 2.28.9000
-%define glibcrelease 26%{?dist}
+%define glibcrelease 27%{?dist}
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
 #
@@ -1905,6 +1905,12 @@ fi
 %files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
 
 %changelog
+* Thu Dec 13 2018 Carlos O'Donell <carlos@redhat.com> - 2.28.9000-27
+- Auto-sync with upstream branch master,
+  commit ade8b817fead73b302d08c88cd44ea2ea56793d4.
+- powerpc: missing CFI register information in __mpn_* functions (swbz#23614)
+- rdlock stalls indefinitely on an unlocked pthread rwlock (swbz#23861)
+
 * Tue Dec 11 2018 Carlos O'Donell <carlos@redhat.com> - 2.28.9000-26
 - Auto-sync with upstream branch master,
   commit 505b5b292293a5d6bd4046a6bc7f8c2381a33da4.
diff --git a/sources b/sources
index 2fa9189..dd10e92 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.28.9000-379-g505b5b2922.tar.xz) = 7d66e9536311bd851354be1fa93c10b0a7ba0fe373de57737bd2fb88cbe6d30586467e9536307f2e28238c2374ea14c94d0c93e2007bb351d227a90102bbe99a
+SHA512 (glibc-2.28.9000-391-gade8b817fe.tar.xz) = 64e72015cfbd95f3f7a07cc83903735764860d6d7b31b37c01ad2f054d1db144169cd4a204c610501396fd071c18bfc85c350e17f4e7097c8d85eaefe783e86d