diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27d17f6..92f3b42 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,31 +41,6 @@ jobs:
           user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}
 
-  win-unittest:
-    name: Windows unittest - ${{ matrix.PYTHON_VERSION }}
-    runs-on: windows-latest
-    env:
-      CI: True
-      PYTHON_VERSION: ${{ matrix.PYTHON_VERSION }}
-    strategy:
-      fail-fast: false
-      matrix:
-        PYTHON_VERSION: ['3.6']
-    steps:
-      - name: Checkout branch
-        uses: actions/checkout@v2
-      - uses: conda-incubator/setup-miniconda@v2
-        with:
-          python-version: ${{ matrix.PYTHON_VERSION }}
-          miniforge-variant: Mambaforge
-          miniforge-version: latest
-          activate-environment: lleaves
-          environment-file: environment.yml
-          use-only-tar-bz2: true
-          use-mamba: true
-      - run: python -m pip install -e . --no-build-isolation --no-use-pep517 --no-deps
-      - run: pytest -v tests
-
   pre-commit-checks:
     name: "Pre-commit checks - Python 3.9"
     runs-on: ubuntu-latest
diff --git a/tests/test_parallel.py b/tests/test_parallel.py
index 344c052..b83290f 100644
--- a/tests/test_parallel.py
+++ b/tests/test_parallel.py
@@ -11,8 +11,8 @@ def test_parallel_iteration():
     lgbm_model = Booster(model_file="tests/models/NYC_taxi/model.txt")
     llvm_model.compile()
 
-    data = np.array(4 * [5 * [1.0]], dtype=np.float32)
-    data_flat = np.array(data.reshape(data.size), dtype=np.float64, copy=False)
+    data = np.array(4 * [5 * [1.0]], dtype=np.float64)
+    data_flat = np.array(data.reshape(data.size), dtype=np.float64)
     np.testing.assert_equal(
         llvm_model.predict(data, n_jobs=4), lgbm_model.predict(data)
     )