Bump version numbers for rc1.
diff --git a/man/meson.1 b/man/meson.1
index d2c6453..c9231e5 100644
--- a/man/meson.1
+++ b/man/meson.1
@@ -1,4 +1,4 @@
-.TH MESON "1" "October 2020" "meson 0.56.0" "User Commands"
+.TH MESON "1" "February 2021" "meson 0.57.0" "User Commands"
.SH NAME
meson - a high productivity build system
.SH DESCRIPTION
diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index a4ce965..232c608 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -1,4 +1,4 @@
-# Copyright 2012-2020 The Meson development team
+# Copyright 2012-2021 The Meson development team
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@
KeyedOptionDictType = T.Union[T.Dict['OptionKey', 'UserOption[T.Any]'], OptionOverrideProxy]
CompilerCheckCacheKey = T.Tuple[T.Tuple[str, ...], str, str, T.Tuple[str, ...], str]
-version = '0.56.99'
+version = '0.57.0.rc1'
backendlist = ['ninja', 'vs', 'vs2010', 'vs2015', 'vs2017', 'vs2019', 'xcode']
default_yielding = False
