diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c8925c0b3..29b00b4e4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -499,7 +499,7 @@ jobs:
       - name: Test Essentials
         # ensure that Python package loads and converter scripts work
         run: |
-          python -c 'import cantera as ct; import sys; sys.exit(0) if ct.__version__.startswith("3.0.0") else sys.exit(1)'
+          python -c 'import cantera as ct; import sys; sys.exit(0) if ct.__version__.startswith("3.1.0") else sys.exit(1)'
           ck2yaml --input=test/data/h2o2.inp --output=h2o2-test.yaml
           test -f h2o2-test.yaml
           cti2yaml test/data/ch4_ion.cti ch4_ion-test.yaml
@@ -578,7 +578,7 @@ jobs:
       # ensure that Python package loads and converter scripts work
       run: |
         set -x
-        python -c 'import cantera as ct; import sys; sys.exit(0) if ct.__version__.startswith("3.0.0") else sys.exit(1)'
+        python -c 'import cantera as ct; import sys; sys.exit(0) if ct.__version__.startswith("3.1.0") else sys.exit(1)'
         ck2yaml --input=test/data/h2o2.inp --output=h2o2-test.yaml
         test -f h2o2-test.yaml
         cti2yaml test/data/ch4_ion.cti ch4_ion-test.yaml
diff --git a/README.rst b/README.rst
index 8de8170cc..f3e9ffff0 100644
--- a/README.rst
+++ b/README.rst
@@ -94,7 +94,7 @@ possible.
 Development Site
 ================
 
-The current development version is 3.0.0. The current stable version is
+The current development version is 3.1.0a1. The current stable version is
 3.0.0. 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 f7d77a273..f7da6b9c9 100644
--- a/SConstruct
+++ b/SConstruct
@@ -950,7 +950,7 @@ for arg in ARGUMENTS:
         logger.error(f"Encountered unexpected command line option: {arg!r}")
         sys.exit(1)
 
-env["cantera_version"] = "3.0.0"
+env["cantera_version"] = "3.1.0a1"
 # For use where pre-release tags are not permitted (MSI, sonames)
 env['cantera_pure_version'] = re.match(r'(\d+\.\d+\.\d+)', env['cantera_version']).group(0)
 env['cantera_short_version'] = re.match(r'(\d+\.\d+)', env['cantera_version']).group(0)
diff --git a/doc/doxygen/Doxyfile b/doc/doxygen/Doxyfile
index 1003f3c1e..82b783c4a 100644
--- a/doc/doxygen/Doxyfile
+++ b/doc/doxygen/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = Cantera
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 3.0.0
+PROJECT_NUMBER         = 3.1.0a1
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a
diff --git a/doc/sphinx/_static/doc-versions.json b/doc/sphinx/_static/doc-versions.json
index 9323e9499..6161c9919 100644
--- a/doc/sphinx/_static/doc-versions.json
+++ b/doc/sphinx/_static/doc-versions.json
@@ -1,11 +1,16 @@
 [
     {
-        "name": "3.0 (dev)",
-        "version": "3.0",
+        "name": "3.1 (dev)",
+        "version": "3.1",
         "url": "/documentation/dev/sphinx/html/"
     },
     {
-        "version": "2.6.0 (stable)",
+        "name": "3.0.0 (stable)",
+        "version": "3.0.0",
+        "url": "/documentation/docs-3.0/sphinx/html/"
+    },
+    {
+        "version": "2.6.0",
         "url": "/documentation/docs-2.6/sphinx/html/"
     },
     {
diff --git a/interfaces/cython/cantera/ck2yaml.py b/interfaces/cython/cantera/ck2yaml.py
index 61e498eec..579f1ddca 100644
--- a/interfaces/cython/cantera/ck2yaml.py
+++ b/interfaces/cython/cantera/ck2yaml.py
@@ -1946,7 +1946,7 @@ class Parser:
             metadata = BlockMap([
                 ("generator", "ck2yaml"),
                 ("input-files", FlowList(files)),
-                ("cantera-version", "3.0.0"),
+                ("cantera-version", "3.1.0a1"),
                 ("date", formatdate(localtime=True)),
             ])
             if desc.strip():
diff --git a/interfaces/cython/cantera/cti2yaml.py b/interfaces/cython/cantera/cti2yaml.py
index d8d5a282e..1c1d722aa 100644
--- a/interfaces/cython/cantera/cti2yaml.py
+++ b/interfaces/cython/cantera/cti2yaml.py
@@ -1661,7 +1661,7 @@ def convert(filename=None, output_name=None, text=None, encoding="latin-1"):
         # information regarding conversion
         metadata = BlockMap([
             ("generator", "cti2yaml"),
-            ("cantera-version", "3.0.0"),
+            ("cantera-version", "3.1.0a1"),
             ("date", formatdate(localtime=True)),
         ])
         if filename != "<string>":
diff --git a/interfaces/cython/cantera/ctml2yaml.py b/interfaces/cython/cantera/ctml2yaml.py
index 80c2f4fd0..f0a6b4004 100644
--- a/interfaces/cython/cantera/ctml2yaml.py
+++ b/interfaces/cython/cantera/ctml2yaml.py
@@ -2637,7 +2637,7 @@ def convert(
     metadata = BlockMap(
         {
             "generator": "ctml2yaml",
-            "cantera-version": "3.0.0",
+            "cantera-version": "3.1.0a1",
             "date": formatdate(localtime=True),
         }
     )