diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 2aacc95..f1378f2 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -23,6 +23,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - uses: actions/setup-python@v5
         with:
           python-version: '3.12'
@@ -48,9 +50,10 @@ jobs:
           - dev
           - standard
         python-version:
-          - "3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
+          - "3.13"
         os:
           - linux
           - win64
@@ -66,6 +69,10 @@ jobs:
             install-mode: dev
             python-version: "3.11"
             mpi: "true"
+        exclude:
+          # ray has no Python 3.13 wheels for Windows
+          - os: win64
+            python-version: "3.13"
     steps:
       - if: matrix.install-mode == 'dev'
         uses: actions/checkout@v4
@@ -97,7 +104,7 @@ jobs:
         run: echo PYTEST_ADDOPTS="$PYTEST_ADDOPTS --cov --cov-report=xml" >> $GITHUB_ENV
       - name: Run pytest
         run: |
-          pip install pytest  # ensure pytest is installed (should do nothing if already present from requirements-dev.txt)
+          pip install pytest
           pytest --pyargs parameter_sweep
       - name: Upload coverage report as job artifact
         if: matrix.coverage
@@ -116,9 +123,7 @@ jobs:
           src/parameter_sweep/tests/test*parameter_sweep.py \
           src/parameter_sweep/loop_tool/tests/test*loop_tool.py \
           --no-cov
-          # merge into single report
           coverage combine
-          # convert to XML
           coverage xml
       - name: Upload coverage report as job artifact
         if: matrix.mpi
@@ -133,8 +138,9 @@ jobs:
     needs: [pytest]
     runs-on: ubuntu-latest
     steps:
-      # the checkout step is needed to have access to codecov.yml
       - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
       - uses: actions/download-artifact@v4
         with:
           pattern: coverage-report-*
@@ -144,8 +150,6 @@ jobs:
           fail_ci_if_error: true
           verbose: true
           token: ${{ secrets.CODECOV_TOKEN }}
-          # downgrading after v0.7.0 broke tokenless upload
-          # see codecov/codecov-action#1487
           version: v0.6.0
 
   build-docs:
@@ -160,4 +164,4 @@ jobs:
         with:
           python-version: '3.11'
       - run: pip install -r requirements-dev.txt
-      - run: make -C docs html
+      - run: make -C docs html
\ No newline at end of file
diff --git a/README.md b/README.md
index 86a0975..7b02fe3 100644
--- a/README.md
+++ b/README.md
@@ -25,4 +25,8 @@ pytest --pyargs parameter_sweep
 
 ```sh
 black .
-```
\ No newline at end of file
+```
+
+## Known Limitations
+- `ray` does not currently provide wheels for Windows + Python 3.13.
+  Use Python 3.12 on Windows if you need the `ray` extra.
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index cf4fc52..b4eedcd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,8 @@ dependencies = [
 ]
 [project.optional-dependencies]
 ray = [
-    "ray",
+    "ray; sys_platform != 'win32' and python_version < '3.14'",
+    "ray; sys_platform == 'win32' and python_version < '3.13'",
 ]
 mpi = [
     "mpi4py",
diff --git a/requirements-dev.txt b/requirements-dev.txt
index e628176..be05be6 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -9,4 +9,4 @@ sphinx-rtd-theme==2.0.0
 astroid < 4
 
 --editable .[testing,ray]
-watertap @ git+https://github.com/watertap-org/watertap@main
+watertap @ git+https://github.com/sufikaur/watertap@align-param-sweep-tag