diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index b00dcb736dd210823c86299ff085ca56dd418f88..054696851d1646c66a20ba2e084daeb72d459d21 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -11,33 +11,42 @@ on:
 
 jobs:
   build:
-
-    runs-on: ubuntu-18.04
+    name: Building on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
     strategy:
       fail-fast: false
       matrix:
+        os: [ubuntu-18.04, macos-latest, windows-latest]
         python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2
+    
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+
+    - name: Brew unlink gcc@9 to avoid build error with OpenMP on MacOS
+      if: matrix.os == 'macos-latest'
+      run: brew unlink gcc@9
+
     - name: Display Python version
       run: python -c "import sys; print(sys.version)"
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install --only-binary=numpy,scipy numpy~=1.19.0 scipy Cython pytest pytest-cov codecov flake8
+        python -m pip install --only-binary=numpy,scipy numpy~=1.19.0 scipy Cython pytest pytest-cov flake8
         python -m pip install -e .[tests]
-        if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
+
     - name: Lint with flake8
       run: |
         # stop the build if there are Python syntax errors or undefined names
         flake8 . --count --select=E9,F63,F7,F82 --show-source --statistics
         # exit-zero treats all errors as warnings. The GitHub editor is 127 chars wide
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
+    
     - name: Test with pytest
       run: |
         python -m pytest --cov=cornac
diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index 4e083592ed5ed0101bbfed0a7c30e67d86959adf..0cbff71ea5699e7aca6967a8c157e854312a1786 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -17,6 +17,7 @@ jobs:
     name: Building on ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-18.04, macos-latest, windows-latest]
         python-version: [3.6, 3.7, 3.8, 3.9]
@@ -28,17 +29,14 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
-    
+
+    - name: Brew unlink gcc@9 to avoid build error with OpenMP on MacOS
+      if: matrix.os == 'macos-latest'
+      run: brew unlink gcc@9
+
     - name: Display Python version
       run: python -c "import sys; print(sys.version)"
     
-    - name: Install GCC with OpenMP support for MacOS
-      if: matrix.os == 'macos-latest'
-      run: |
-        brew reinstall gcc@9
-        brew unlink gcc
-        brew link gcc
-    
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
diff --git a/setup.py b/setup.py
index 0629dd88c7e10001295e2b1054e6e3d9329670e7..2326a1fd4e1963e7371974c148829b9c1d36b1cc 100644
--- a/setup.py
+++ b/setup.py
@@ -97,8 +97,8 @@ else:
             os.environ["CC"] = gcc
             os.environ["CXX"] = gcc
         else:
-            USE_OPENMP = False 
-            print("No GCC available. Install gcc from Homebrew " "using brew install gcc.")
+            USE_OPENMP = False
+            print("No GCC available. Install gcc from Homebrew using brew install gcc.")
             # required arguments for default gcc of OSX
             compile_args.extend(["-O2", "-stdlib=libc++", "-mmacosx-version-min=10.7"])
             link_args.extend(["-O2", "-stdlib=libc++", "-mmacosx-version-min=10.7"])
@@ -305,7 +305,7 @@ setup(
     extras_require={"tests": ["pytest", "pytest-pep8", "pytest-xdist", "pytest-cov"]},
     cmdclass=cmdclass,
     packages=find_packages(),
-    classifiers=(
+    classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Science/Research",
         "Intended Audience :: Education",
@@ -318,5 +318,5 @@ setup(
         "License :: OSI Approved :: Apache Software License",
         "Topic :: Software Development",
         "Topic :: Scientific/Engineering",
-    ),
+    ],
 )