diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index 7148dfc..28b0b66 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -14,12 +14,12 @@ jobs:
     permissions:
       id-token: write  # IMPORTANT: this permission is mandatory for trusted publishing
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Python
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
-        python-version: 3.8
+        python-version: "3.10"
 
     - name: Build distribution
       run: python -m pip install build && python -m build
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a802a8c..ce22e57 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -11,17 +11,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ["3.9", "3.10", "3.11"]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
-      uses: actions/setup-python@v2
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         pip install 'git+https://git@github.com/laws-africa/cobalt.git@master#egg=cobalt'
         pip install -e '.[test]'
-    - name: Test with nosetests
-      run: nosetests
+    - name: Run tests
+      run: python -m unittest
diff --git a/README.md b/README.md
index e750784..6953312 100644
--- a/README.md
+++ b/README.md
@@ -605,6 +605,7 @@ and removes the `displaced` element.
 1. We use a version of `canopy` from github, so clone it into the same directory as this directory: `git clone https://github.com/jcoglan/canopy.git`
 2. Build canopy: `cd canopy; npm install; make; cd ..`
 3. Build grammar changes with `make`, which runs our Makefile to compile the grammar
+4. Run tests with: `python -m unittest`
 
 ## Releasing a new version
 
diff --git a/bluebell/__init__.py b/bluebell/__init__.py
index 55e4709..528787c 100644
--- a/bluebell/__init__.py
+++ b/bluebell/__init__.py
@@ -1 +1 @@
-__version__ = "2.3.0"
+__version__ = "3.0.0"
diff --git a/pyproject.toml b/pyproject.toml
index cc5acb6..04644f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,7 @@ authors = [
 ]
 license = {text = "LGPLv3+"}
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 classifiers = [
     "Development Status :: 5 - Production/Stable",
     "Intended Audience :: Developers",
@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3",
 ]
 dependencies = [
-    "cobalt>=8.0.0",
+    "cobalt>=9.0.0",
     "lxml>=3.4.1",
 ]
 dynamic = ["version"]
@@ -32,7 +32,7 @@ dynamic = ["version"]
 "Bug Tracker" = "https://github.com/laws-africa/bluebell/issues"
 
 [project.optional-dependencies]
-test = ["nose", "flake8"]
+test = ["flake8"]
 
 [project.scripts]
 bluebell = "bluebell.cli:main"