diff --git a/README.rst b/README.rst
index eab431237..dd2bc8b52 100644
--- a/README.rst
+++ b/README.rst
@@ -90,7 +90,8 @@ and we will address it as soon as possible.
 Development Site
 ================
 
-The current stable version is 2.4.0. The `latest Cantera source code <https://github.com/Cantera/cantera>`_, the
+The current development version is 2.5.0a1. The current stable version is 2.4.0.
+The `latest Cantera source code <https://github.com/Cantera/cantera>`_, the
 `issue tracker <https://github.com/Cantera/cantera/issues>`_ for bugs and
 enhancement requests, `downloads of Cantera releases and binary installers
 <https://github.com/Cantera/cantera/releases>`_ , and the `Cantera wiki
diff --git a/SConstruct b/SConstruct
index 64012ff47..261fdc23f 100644
--- a/SConstruct
+++ b/SConstruct
@@ -655,7 +655,7 @@ config_options = [
     BoolVariable(
         'versioned_shared_library',
         """If enabled, create a versioned shared library, with symlinks to the
-           more generic library name, e.g. 'libcantera_shared.so.2.4.0' as the
+           more generic library name, e.g. 'libcantera_shared.so.2.5.0' as the
            actual library and 'libcantera_shared.so' and 'libcantera_shared.so.2'
            as symlinks.
            """,
@@ -717,7 +717,7 @@ for arg in ARGUMENTS:
         sys.exit(1)
 
 # Require a StrictVersion-compatible version
-env['cantera_version'] = "2.4.0"
+env['cantera_version'] = "2.5.0a1"
 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 fac3fd552..c70d923c3 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         = 2.4.0
+PROJECT_NUMBER         = 2.5.0a1
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.