diff --git a/glibc.spec b/glibc.spec
index 0c9327e..4552e7a 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,6 +1,6 @@
-%define glibcsrcdir glibc-2.27.9000-226-gfbce6f7260
+%define glibcsrcdir glibc-2.27.9000-247-gd39c0a459e
 %define glibcversion 2.27.9000
-%define glibcrelease 12%{?dist}
+%define glibcrelease 13%{?dist}
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
 #
@@ -1930,6 +1930,10 @@ fi
 %endif
 
 %changelog
+* Thu Mar 29 2018 Florian Weimer <fweimer@redhat.com> - 2.27.9000-13
+- Auto-sync with upstream branch master,
+  commit d39c0a459ef32a41daac4840859bf304d931adab.
+
 * Mon Mar 19 2018 Florian Weimer <fweimer@redhat.com> - 2.27.9000-12
 - Auto-sync with upstream branch master,
   commit fbce6f7260c3847f14dfa38f60c9111978fb33a5.
diff --git a/sources b/sources
index 28bb7af..4c1ede5 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.27.9000-226-gfbce6f7260.tar.gz) = f382baf56f11e4e8b08ca689f5199f7f27f976b4f127052b38173185b8958dfab4d21ae128df6afd1b18ad63c9bb36b8629533ed5c18b00215f4d22493d7d127
+SHA512 (glibc-2.27.9000-247-gd39c0a459e.tar.gz) = 4d4c43459a1c558700c8a6bc3a25590024d659c625bc9f945631e0086386150f3c5d8f6f10ba701f0c732f128906679cf22b0fae52004afe38b6021671f3067a