diff --git a/README.rst b/README.rst
index f9a26c1cdb..5bdb10c4a5 100644
--- a/README.rst
+++ b/README.rst
@@ -88,7 +88,7 @@ possible.
 Development Site
 ================
 
-The current development version is 2.5.0a2. The current stable version is
+The current development version is 2.5.0a3. 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
diff --git a/SConstruct b/SConstruct
index ea57e8debe..3788535db9 100644
--- a/SConstruct
+++ b/SConstruct
@@ -700,7 +700,7 @@ for arg in ARGUMENTS:
         sys.exit(1)
 
 # Require a StrictVersion-compatible version
-env['cantera_version'] = "2.5.0a2"
+env['cantera_version'] = "2.5.0a3"
 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 2e311e630f..408191c091 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         = 2.5.0a2
+PROJECT_NUMBER         = 2.5.0a3
 
 # The OUTPUT_DIRECTORY tag is used to specify the (relative or absolute)
 # base path where the generated documentation will be put.
diff --git a/interfaces/cython/cantera/ck2yaml.py b/interfaces/cython/cantera/ck2yaml.py
index 975029775d..1db297ae23 100644
--- a/interfaces/cython/cantera/ck2yaml.py
+++ b/interfaces/cython/cantera/ck2yaml.py
@@ -1845,7 +1845,7 @@ def write_yaml(self, name='gas', out_name='mech.yaml'):
             metadata = BlockMap([
                 ('generator', 'ck2yaml'),
                 ('input-files', FlowList(files)),
-                ('cantera-version', '2.5.0a2'),
+                ('cantera-version', '2.5.0a3'),
                 ('date', formatdate(localtime=True)),
             ])
             if desc.strip():
diff --git a/interfaces/cython/cantera/cti2yaml.py b/interfaces/cython/cantera/cti2yaml.py
index a0d64bfa23..84b78fbec2 100644
--- a/interfaces/cython/cantera/cti2yaml.py
+++ b/interfaces/cython/cantera/cti2yaml.py
@@ -1602,7 +1602,7 @@ def convert(filename=None, output_name=None, text=None):
         # information regarding conversion
         metadata = BlockMap([
             ('generator', 'cti2yaml'),
-            ('cantera-version', '2.5.0a2'),
+            ('cantera-version', '2.5.0a3'),
             ('date', formatdate(localtime=True)),
         ])
         if filename is not None: