diff --git a/README.rst b/README.rst
index 0bdb473ff..7eb9ff882 100644
--- a/README.rst
+++ b/README.rst
@@ -3,7 +3,7 @@
 CANTERA
 *******
 
-Version 2.3.0a2 (development)
+Version 2.3.0a3 (development)
 
 License Information
 ===================
diff --git a/SConstruct b/SConstruct
index 5353eb307..1d9118c69 100644
--- a/SConstruct
+++ b/SConstruct
@@ -603,7 +603,7 @@ for arg in ARGUMENTS:
         sys.exit(1)
 
 # Require a StrictVersion-compatible version
-env['cantera_version'] = "2.3.0a2"
+env['cantera_version'] = "2.3.0a3"
 ctversion = StrictVersion(env['cantera_version'])
 # For use where pre-release tags are not permitted (MSI, sonames)
 env['cantera_pure_version'] = '.'.join(str(x) for x in ctversion.version)
diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index d615bd8ae..3bc42095e 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -34,7 +34,7 @@ PROJECT_NAME           = Cantera
 # This could be handy for archiving the generated documentation or
 # if some version control system is used.
 
-PROJECT_NUMBER         = 2.3.0a1
+PROJECT_NUMBER         = 2.3.0a3
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.