diff --git a/glibc.spec b/glibc.spec
index 80ea367..4870777 100644
--- a/glibc.spec
+++ b/glibc.spec
@@ -1,4 +1,4 @@
-%define glibcsrcdir glibc-2.34.9000-376-g4435c29892
+%define glibcsrcdir glibc-2.34.9000-392-gb99b0f93ee
 %define glibcversion 2.34.9000
 # Pre-release tarballs are pulled in from git using a command that is
 # effectively:
@@ -148,7 +148,7 @@ end \
 Summary: The GNU libc libraries
 Name: glibc
 Version: %{glibcversion}
-Release: 32%{?dist}
+Release: 33%{?dist}
 
 # In general, GPLv2+ is used by programs, LGPLv2+ is used for
 # libraries.
@@ -2153,6 +2153,26 @@ update_gconv_modules_cache ()
 %files -f compat-libpthread-nonshared.filelist -n compat-libpthread-nonshared
 
 %changelog
+* Fri Dec 17 2021 Florian Weimer <fweimer@redhat.com> - 2.34.9000-33
+- Auto-sync with upstream branch master,
+  commit b99b0f93ee8762fe53ff65802deb6f00700b9924:
+- nss: Use "files dns" as the default for the hosts database (#2033020)
+- arm: Guard ucontext _rtld_global_ro access by SHARED, not PIC macro
+- Fix The GNU ToolChain Authors copyright notice
+- Remove upper limit on tunable MALLOC_MMAP_THRESHOLD
+- localedata: add new locale ab_GE
+- Fix __minimal_malloc segfaults in __mmap due to stack-protector
+- __glibc_unsafe_len: Fix comment
+- malloc: Enable huge page support on main arena
+- malloc: Move MORECORE fallback mmap to sysmalloc_mmap_fallback
+- malloc: Add Huge Page support to arenas
+- malloc: Add Huge Page support for mmap
+- malloc: Move mmap logic to its own function
+- malloc: Add THP/madvise support for sbrk
+- malloc: Add madvise support for Transparent Huge Pages
+- powerpc: Use global register variable in <thread_pointer.h>
+- Use LFS and 64 bit time for installed programs (swbz#15333)
+
 * Wed Dec 15 2021 Arjun Shankar <arjun@redhat.com> - 2.34.9000-32
 - Do not use --enable-static-pie configure flag since it is now ignored
 
diff --git a/sources b/sources
index b32ddee..a1a1352 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (glibc-2.34.9000-376-g4435c29892.tar.xz) = 330ba4a95f78dfdf61daf2753763ac790c2c89027136b4e897b86430fe37b1f118b48514ed4293d9a13bdc9dc0b2681b731da1ab9c32bc4b21278b7dc52d5604
+SHA512 (glibc-2.34.9000-392-gb99b0f93ee.tar.xz) = b8d50a79b7f09dba13a6abf3f8eb27905a69f1d958afc8118333c8d5f679cf334fa46cc4f33bc3ff5244dca29e3226cfdc138c8c542801ad1d49f790130be0b5