diff --git a/README b/README
index 2ad7a5051..f3a4806da 100644
--- a/README
+++ b/README
@@ -3,7 +3,7 @@
 CANTERA
 *******
 
-Version 2.1.0 (stable)
+Version 2.2a (development)
 
 License Information
 ===================
diff --git a/SConstruct b/SConstruct
index 8779a727e..3327062e9 100644
--- a/SConstruct
+++ b/SConstruct
@@ -624,7 +624,7 @@ config_options = [
         name recognized by the 'dot' program. On linux systems, this
         should be lowercase 'helvetica'.""",
      'Helvetica'),
-    ('cantera_version', '', '2.1.0')
+    ('cantera_version', '', '2.2a')
 ]
 
 opts.AddVariables(*config_options)
diff --git a/configure.ac b/configure.ac
index 0250c21da..fc47622b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2,7 +2,7 @@
 # Process this file with autoconf to produce a configure script.
 
 AC_PREREQ(2.61)
-AC_INIT([cantera], [2.1.0], [nick@ices.utexas.edu])
+AC_INIT([cantera], [2.2a], [nick@ices.utexas.edu])
 AC_CONFIG_HEADER(config.h)
 AC_CONFIG_AUX_DIR([build-aux])
 #AX_ENABLE_BUILDDIR
diff --git a/doc/sphinx/conf.py b/doc/sphinx/conf.py
index 29f6bb5ae..dc9bb1726 100644
--- a/doc/sphinx/conf.py
+++ b/doc/sphinx/conf.py
@@ -73,9 +73,9 @@ copyright = u'2012, Cantera Developers'
 # built documents.
 #
 # The short X.Y version.
-version = '2.1'
+version = '2.2'
 # The full version, including alpha/beta/rc tags.
-release = '2.1.0'
+release = '2.2a'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/site_scons/wxsgen.py b/site_scons/wxsgen.py
index 8c7909901..6c5607c3c 100644
--- a/site_scons/wxsgen.py
+++ b/site_scons/wxsgen.py
@@ -12,11 +12,11 @@ class WxsGenerator(object):
         if self.x64:
             self.CANTERA_UUID = uuid.UUID('F707EB9E-3723-11E1-A99F-525400631BAF')
             self.pfilesName = 'ProgramFiles64Folder'
-            self.productName = 'Cantera 2.1 (64-bit)'
+            self.productName = 'Cantera 2.2 (64-bit)'
         else:
             self.CANTERA_UUID = uuid.UUID('1B36CAF0-279D-11E1-8979-001FBC085391')
             self.pfilesName = 'ProgramFilesFolder'
-            self.productName = 'Cantera 2.1 (32-bit)'
+            self.productName = 'Cantera 2.2 (32-bit)'
 
     def Directory(self, parent, Id, Name):
         return et.SubElement(parent, 'Directory',
@@ -76,14 +76,14 @@ class WxsGenerator(object):
                                      UpgradeCode='2340BEE1-279D-11E1-A4AA-001FBC085391',
                                      Language='1033',
                                      Codepage='1252',
-                                     Version='2.1.0',
+                                     Version='2.2.0',
                                      Manufacturer='Cantera Developers'))
 
         fields = {'Platform': 'x64'} if self.x64 else {}
         package = et.SubElement(product, "Package",
                                 dict(Id='*',
                                      Keywords='Installer',
-                                     Description="Cantera 2.1 Installer",
+                                     Description="Cantera 2.2 Installer",
                                      InstallerVersion='310',
                                      Languages='1033',
                                      Compressed='yes',
@@ -145,7 +145,7 @@ class WxsGenerator(object):
 
         # Registry entries
         reg_key = self.addRegistryKey(core, product, Id='CanteraRegRoot', Root='HKLM',
-                                      Key='Software\\Cantera\\Cantera 2.1',
+                                      Key='Software\\Cantera\\Cantera 2.2',
                                       Action='createAndRemoveOnUninstall')
         et.SubElement(reg_key, 'RegistryValue', dict(Type='string',
                                                      Name='InstallDir',