diff --git a/.github/actions/install_requirements/action.yml b/.github/actions/install_requirements/action.yml
index c5d4db43..614ce70a 100644
--- a/.github/actions/install_requirements/action.yml
+++ b/.github/actions/install_requirements/action.yml
@@ -29,16 +29,16 @@ runs:
 
     - name: Create lockfile
       run: |
-        mkdir -p lockfiles
-        pip freeze --exclude-editable > lockfiles/${{ inputs.requirements_file }}
+        mkdir -p lockfiles-${{ inputs.python_version }}
+        pip freeze --exclude-editable > lockfiles-${{ inputs.python_version }}/${{ inputs.requirements_file }}
         # delete the self referencing line and make sure it isn't blank
-        sed -i'' -e '/file:/d' lockfiles/${{ inputs.requirements_file }}
+        sed -i'' -e '/file:/d' lockfiles-${{ inputs.python_version }}/${{ inputs.requirements_file }}
       shell: bash
 
     - name: Upload lockfiles
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
-        name: lockfiles
+        name: lockfiles-${{ inputs.python_version }}
         path: lockfiles
 
     # This eliminates the class of problems where the requirements being given no
@@ -49,10 +49,9 @@ runs:
     - name: If requirements file exists, check it matches pip installed packages
       run: |
         if [ -s ${{ inputs.requirements_file }} ]; then
-          if ! diff -u ${{ inputs.requirements_file }} lockfiles/${{ inputs.requirements_file }}; then
+          if ! diff -u ${{ inputs.requirements_file }} lockfiles-${{ inputs.python_version }}/${{ inputs.requirements_file }}; then
             echo "Error: ${{ inputs.requirements_file }} need the above changes to be exhaustive"
             exit 1
           fi
         fi
       shell: bash
-
diff --git a/.github/workflows/code.yml b/.github/workflows/code.yml
index bbaae0a2..25845626 100644
--- a/.github/workflows/code.yml
+++ b/.github/workflows/code.yml
@@ -11,17 +11,17 @@ jobs:
       fail-fast: false
       matrix:
         os: ["ubuntu-latest"] # can add windows-latest, macos-latest
-        python: ["3.8", "3.9", "3.10", "3.11"]
+        python: ["3.9", "3.10", "3.11", "3.12"]
         install: ["-e .[dev]"]
         # Make one version be non-editable to test both paths of version code
         include:
           - os: "ubuntu-latest"
-            python: "3.7"
+            python: "3.8"
             install: ".[dev]"
 
     runs-on: ${{ matrix.os }}
     container:
-      image: ghcr.io/epics-containers/epics-base-linux-developer:23.6.1
+      image: ghcr.io/epics-containers/epics-base-developer:7.0.9ec3
       volumes:
         - /opt/hostedtoolcache:/opt/hostedtoolcache
 
@@ -86,9 +86,9 @@ jobs:
           CIBW_SKIP: pp* *i686*
 
       - name: Upload sdist and wheels as artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: dist
+          name: dist-${{ matrix.os }}-${{ matrix.python }}
           path: dist
 
       - name: Check for packaging errors
@@ -104,7 +104,11 @@ jobs:
       HAS_PYPI_TOKEN: ${{ secrets.PYPI_TOKEN != '' }}
 
     steps:
-      - uses: actions/download-artifact@v3
+      - uses: actions/download-artifact@v4
+        with:
+            pattern: dist*
+            path: dist
+            merge-multiple: true
 
       - name: Fixup blank lockfiles
         # Github release artifacts can't be blank
diff --git a/pyproject.toml b/pyproject.toml
index f6b15adb..79ccdf8f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ classifiers = [
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
     "License :: OSI Approved :: GNU General Public License v2 or later (GPLv2+)",
 ]
 description = "Build tools using cooperative threading"
@@ -33,7 +34,6 @@ dev = [
     "pre-commit",
     "pydata-sphinx-theme>=0.12",
     "pytest",
-    "pytest-cov",
     "sphinx-autobuild",
     "sphinx-copybutton",
     "sphinx-design",
@@ -106,7 +106,7 @@ allowlist_externals =
     sphinx-build
     sphinx-autobuild
 commands =
-    pytest: pytest --cov=cothread --cov-report term --cov-report xml:cov.xml {posargs}
+    pytest: pytest {posargs}
     pre-commit: pre-commit run --all-files {posargs}
     docs: sphinx-{posargs:build -EW --keep-going} -T docs build/html
 """