diff --git a/glibc.spec b/glibc.spec
index 964b4fd..5534349 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,6 +1,6 @@
-%define glibcsrcdir  glibc-2.26-181-g3d7b66f66c
+%define glibcsrcdir  glibc-2.26-191-g2dba5ce7b8
 %define glibcversion 2.26.90
-%define glibcrelease 11%{?dist}
+%define glibcrelease 12%{?dist}
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
 #
@@ -2065,6 +2065,10 @@ fi
 %endif
 
 %changelog
+* Mon Aug 28 2017 Florian Weimer <fweimer@redhat.com> - 2.26.90-12
+- Auto-sync with upstream master,
+  commit 2dba5ce7b8115d6a2789bf279892263621088e74.
+
 * Fri Aug 25 2017 Florian Weimer <fweimer@redhat.com> - 2.26.90-11
 - Auto-sync with upstream master,
   commit 3d7b66f66cb223e899a7ebc0f4c20f13e711c9e0:
diff --git a/sources b/sources
index 65a3cab..0f7eff9 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.26-181-g3d7b66f66c.tar.gz) = dfc4a9f451eceab94ffa83355e883276d024643e99fde068c9341ffe4cbb6a7b6f1a3f66609a47db7b18ed98d992888689e947feaca51e5b788ab1c6c1429951
+SHA512 (glibc-2.26-191-g2dba5ce7b8.tar.gz) = 08b2403b86bc09d60045078c8bebcd5fc3ff79896491a51642af2e7cff3ebf3e08dd4a7a1b54cbe2980ef728dcb5ab3865480a3dfa01cc6b51cb622124a55d29