diff --git a/glibc.spec b/glibc.spec
index 219188f..f00686a 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,6 +1,6 @@
-%define glibcsrcdir glibc-2.26.9000-1217-gcdd14619a7
-%define glibcversion 2.26.9000
-%define glibcrelease 52%{?dist}
+%define glibcsrcdir glibc-2.27
+%define glibcversion 2.27
+%define glibcrelease 1%{?dist}
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
 #
@@ -2001,6 +2001,11 @@ fi
 %endif
 
 %changelog
+* Mon Feb 05 2018 Carlos O'Donell <carlos@redhat.com> - 2.27-1
+- Update to released glibc 2.27.
+- Auto-sync with upstream branch master,
+  commit 23158b08a0908f381459f273a984c6fd328363cb.
+
 * Tue Jan 30 2018 Richard W.M. Jones <rjones@redhat.com> - 2.26.9000-52
 - Disable -fstack-clash-protection on riscv64:
   not supported even by GCC 7.3.1 on this architecture.
diff --git a/sources b/sources
index a85f5b6..7c72447 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.26.9000-1217-gcdd14619a7.tar.gz) = 1670e012b48a13417d540efc3ee141192764e292f4623e305373276f4f9b11c8da6fc22c4d50c922a2527386d8c34b31f4a974cff6849677e647974b709e2c67
+SHA512 (glibc-2.27.tar.gz) = a42cf88bd9965c1ad95579672f32809d5555d8f035305f25f76240c5735ea15029d7c818501139d6a2faf834bf75f57cbe6d28a42083d6a3cb2a1d8e8117b4ad