Updated version number for 0.42.1 release.
diff --git a/man/meson.1 b/man/meson.1
index b453828..3a74816 100644
--- a/man/meson.1
+++ b/man/meson.1
@@ -1,4 +1,4 @@
-.TH MESON "1" "August 2017" "meson 0.42.0" "User Commands"
+.TH MESON "1" "September 2017" "meson 0.42.1" "User Commands"
 .SH NAME
 meson - a high productivity build system
 .SH DESCRIPTION
diff --git a/man/mesonconf.1 b/man/mesonconf.1
index ae28e35..2cc0fd5 100644
--- a/man/mesonconf.1
+++ b/man/mesonconf.1
@@ -1,4 +1,4 @@
-.TH MESONCONF "1" "August 2017" "mesonconf 0.42.0" "User Commands"
+.TH MESONCONF "1" "September 2017" "mesonconf 0.42.1" "User Commands"
 .SH NAME
 mesonconf - a tool to configure Meson builds
 .SH DESCRIPTION
diff --git a/man/mesonintrospect.1 b/man/mesonintrospect.1
index eae7b4a..c496696 100644
--- a/man/mesonintrospect.1
+++ b/man/mesonintrospect.1
@@ -1,4 +1,4 @@
-.TH MESONCONF "1" "August 2017" "mesonintrospect 0.42.0" "User Commands"
+.TH MESONCONF "1" "September 2017" "mesonintrospect 0.42.1" "User Commands"
 .SH NAME
 mesonintrospect - a tool to extract information about a Meson build
 .SH DESCRIPTION
diff --git a/man/mesontest.1 b/man/mesontest.1
index ed676dc..d0c711a 100644
--- a/man/mesontest.1
+++ b/man/mesontest.1
@@ -1,4 +1,4 @@
-.TH MESON "1" "August 2017" "meson 0.42.0" "User Commands"
+.TH MESON "1" "September 2017" "meson 0.42.1" "User Commands"
 .SH NAME
 mesontest - test tool for the Meson build system
 .SH DESCRIPTION
diff --git a/man/wraptool.1 b/man/wraptool.1
index 50546d5..0bf4775 100644
--- a/man/wraptool.1
+++ b/man/wraptool.1
@@ -1,4 +1,4 @@
-.TH WRAPTOOL "1" "August 2017" "meson 0.42.0" "User Commands"
+.TH WRAPTOOL "1" "September 2017" "meson 0.42.1" "User Commands"
 .SH NAME
 wraptool - source dependency downloader
 .SH DESCRIPTION
diff --git a/mesonbuild/coredata.py b/mesonbuild/coredata.py
index a2b2eab..2e23af8 100644
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -19,7 +19,7 @@
 from .mesonlib import default_libdir, default_libexecdir, default_prefix
 import ast
 
-version = '0.42.0'
+version = '0.42.1'
 backendlist = ['ninja', 'vs', 'vs2010', 'vs2015', 'vs2017', 'xcode']
 
 class UserOption: