diff --git a/.github/tmp-uv-overrides.txt b/.github/tmp-uv-overrides.txt
new file mode 100644
index 0000000000..fac663f74f
--- /dev/null
+++ b/.github/tmp-uv-overrides.txt
@@ -0,0 +1,2 @@
+# Temporary: jq has no cp315 Windows wheel and its sdist does not build on Windows.
+jq; sys_platform != "win32"
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b5d35358a7..d97e8863be 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -33,6 +33,7 @@ env:
   # Temporary: PyTorch publishes cp315 wheels only on its own index so far.
   UV_EXTRA_INDEX_URL: https://download.pytorch.org/whl/cpu
   UV_INDEX_STRATEGY: unsafe-best-match
+  UV_OVERRIDE: ${{ github.workspace }}/.github/tmp-uv-overrides.txt
   # numpy's stubs require a 3.12+ interpreter, so type checking runs above the floor.
   # See [tool.mypy] in pyproject.toml.
   MYPY_PYTHON_VERSION: "3.12"
@@ -153,6 +154,8 @@ jobs:
           echo "env=$(hatch env find test)" >> "$GITHUB_OUTPUT"
 
       - name: Run
+        env:
+          PYTEST_ADDOPTS: ${{ matrix.os == 'windows-latest' && '--ignore=test/components/converters/test_json.py' || '' }}
         run: hatch run test:unit
 
       - uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0