diff --git a/gcc/DATESTAMP b/gcc/DATESTAMP
index faac45ae8d20defaf1f6d923528136e10abc11b3..dd82014ea01b640762b1c793bb53c06ff7677065 100644
--- a/gcc/DATESTAMP
+++ b/gcc/DATESTAMP
@@ -1 +1 @@
-20230427
+20230428
diff --git a/gcc/c/ChangeLog b/gcc/c/ChangeLog
index 2f8b8d7b0e81e52d64a9ddfa623501b4d733a84e..70f4e11ec734b2ed84f8f91741bac3aaebf264e7 100644
--- a/gcc/c/ChangeLog
+++ b/gcc/c/ChangeLog
@@ -1,3 +1,23 @@
+2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/109409
+	* c-parser.cc (c_parser_initializer): Move diagnostics about
+	initialization of variable sized object with non-empty initializer
+	after c_parser_expr_no_commas call and ret.set_error (); after it.
+
+2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/107682
+	PR c/109412
+	* c-typeck.cc (pop_init_level): If constructor_type is FUNCTION_TYPE,
+	reject empty initializer as invalid.
+
 2023-04-26  Jakub Jelinek  <jakub@redhat.com>
 
 	Backported from master:
diff --git a/gcc/po/ChangeLog b/gcc/po/ChangeLog
index 2a5c36b15832de3996ca0f2e55828bbb2e26a278..ae0e0ce5d33fb47c34360574cffa231bd761d534 100644
--- a/gcc/po/ChangeLog
+++ b/gcc/po/ChangeLog
@@ -1,3 +1,9 @@
+2023-04-27  Joseph Myers  <joseph@codesourcery.com>
+
+	* be.po, da.po, de.po, el.po, es.po, fi.po, fr.po, hr.po, id.po,
+	ja.po, nl.po, ru.po, sr.po, sv.po, tr.po, uk.po, vi.po, zh_CN.po,
+	zh_TW.po: Update.
+
 2023-04-26  Release Manager
 
 	* GCC 13.1.0 released.
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 4f603cb8f3faefed0b67e0346b09216892957b78..88b714f849da5e5e6ea726664b83fb891c0f0bdf 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,20 @@
+2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/109409
+	* gcc.dg/pr109409.c: New test.
+
+2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jakub Jelinek  <jakub@redhat.com>
+
+	PR c/107682
+	PR c/109412
+	* gcc.dg/pr109412.c: New test.
+
 2023-04-26  Andrew Stubbs  <ams@codesourcery.com>
 
 	Backported from master:
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 84d62c13f51835b55fb5b1a323acc06e4e634032..3bd827021b5c8f8188204b2ef10cf5434f1b6f90 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,31 @@
+2023-04-27  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jonathan Wakely  <jwakely@redhat.com>
+
+	* include/bits/mofunc_impl.h: Fix typo in doxygen comment.
+	* include/std/format: Likewise.
+
+2023-04-27  Jonathan Wakely  <jwakely@redhat.com>
+
+	Backported from master:
+	2023-04-27  Jonathan Wakely  <jwakely@redhat.com>
+
+	* doc/doxygen/user.cfg.in (SOURCE_BROWSER): Only set to YES for
+	HTML docs.
+	* include/bits/gslice_array.h (_DEFINE_VALARRAY_OPERATOR): Omit
+	from doxygen docs.
+	* include/bits/indirect_array.h (_DEFINE_VALARRAY_OPERATOR):
+	Likewise.
+	* include/bits/mask_array.h (_DEFINE_VALARRAY_OPERATOR):
+	Likewise.
+	* include/bits/slice_array.h (_DEFINE_VALARRAY_OPERATOR):
+	Likewise.
+	* include/std/valarray (_DEFINE_VALARRAY_UNARY_OPERATOR)
+	(_DEFINE_VALARRAY_AUGMENTED_ASSIGNMENT)
+	(_DEFINE_VALARRAY_EXPR_AUGMENTED_ASSIGNMENT)
+	(_DEFINE_BINARY_OPERATOR): Likewise.
+
 2023-04-26  Release Manager
 
 	* GCC 13.1.0 released.