diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bd576c0..f361d22 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,6 +9,7 @@ on:
 
 jobs:
   manylinux_build:
+    # build wheels for some linux
     name: Build linux ${{ matrix.python.name }} wheel
     runs-on: ubuntu-latest
     container: quay.io/pypa/manylinux2014_x86_64
@@ -44,7 +45,7 @@ jobs:
     steps:
 
       - name: Checkout sources
-        uses: actions/checkout@v1
+        uses: actions/checkout@v3
         with:
           submodules: true
 
@@ -65,6 +66,10 @@ jobs:
           python3 setup.py bdist_wheel
           auditwheel repair dist/*.whl
 
+      - name: Build source archive
+        if: matrix.python.name == 'cp311'
+        run: python setup.py sdist
+
       - name: Install wheel
         run: pip3 install wheelhouse/*.whl --user
 
@@ -85,25 +90,24 @@ jobs:
           python3 -c "from lightsim2grid import LightSimBackend; import grid2op; env = grid2op.make('l2rpn_case14_sandbox', test=True, backend=LightSimBackend())"
 
       - name: Upload wheel
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: lightsim2grid-wheel-linux-${{ matrix.python.name }}
           path: wheelhouse/*.whl
 
-  macos_windows_build:
-    name: Build ${{ matrix.config.name }} ${{ matrix.python.name }} wheel
-    runs-on: ${{ matrix.config.os }}
+      - name: Upload source archive
+        uses: actions/upload-artifact@v3
+        if: matrix.python.name == 'cp311'
+        with:
+          name: lightsim2grid-sources
+          path: dist/*.tar.gz
+
+  windows_build:
+    # build wheels for windows
+    name: Build windows ${{ matrix.python.name }} wheel
+    runs-on: windows-2019
     strategy:
       matrix:
-        config:
-          - {
-            name: darwin,
-            os: macos-latest,
-          }
-          - {
-            name: windows,
-            os: windows-2019,
-          }
         python:
           - {
             name: cp37,
@@ -125,16 +129,19 @@ jobs:
             name: cp311,
             version: '3.11',
           }
+    env:
+      RUNNER_OS: windows-2019
+      PYTHON_VERSION: ${{ matrix.python.version }}
 
     steps:
 
       - name: Checkout sources
-        uses: actions/checkout@v1
+        uses: actions/checkout@v3
         with:
           submodules: true
 
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python.version }}
 
@@ -143,15 +150,7 @@ jobs:
           python -m pip install --upgrade pip
           python -m pip install -r requirements.txt
 
-      - name: Compile SuiteSparse make
-        if: matrix.config.name == 'darwin'
-        run: |
-          make
-          export __O3_OPTIM=1
-          python3 setup.py build
-
       - name: Compile SuiteSparse cmake
-        if: matrix.config.name == 'windows'
         run: |
           cd build_cmake
           python generate_c_files.py
@@ -168,10 +167,6 @@ jobs:
       - name: Build wheel
         run: python setup.py bdist_wheel
 
-      - name: Build source archive
-        if: matrix.config.name == 'darwin' && matrix.python.name == 'cp39'
-        run: python setup.py sdist
-
       - name: Install wheel
         shell: bash
         run: python -m pip install dist/*.whl --user
@@ -189,31 +184,151 @@ jobs:
           python -c "from lightsim2grid import LightSimBackend; import grid2op; env = grid2op.make('l2rpn_case14_sandbox', test=True, backend=LightSimBackend())"
 
       - name: Upload wheel
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: lightsim2grid-wheel-${{ matrix.config.name }}-${{ matrix.python.name }}
           path: dist/*.whl
 
-      - name: Upload source archive
-        uses: actions/upload-artifact@v2
-        if: matrix.config.name == 'darwin' && matrix.python.name == 'cp39'
+  macos_build_37:
+    # build wheel for python 3.7 for macos
+    name: Build macos ${{ matrix.python.name }} wheel
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        python:
+          - {
+            name: cp37,
+            version: '3.7',
+          }
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v3
         with:
-          name: lightsim2grid-sources
-          path: dist/*.tar.gz
+          submodules: true
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python.version }}
+
+      - name: Install Python dependencies
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+
+      - name: Compile SuiteSparse make
+        run: |
+          make
+          export __O3_OPTIM=1
+          python3 setup.py build
+
+      - name: Build wheel
+        run: python setup.py bdist_wheel
+
+      - name: Install wheel
+        shell: bash
+        run: python -m pip install dist/*.whl --user
+
+      - name: Check package can be imported
+        run: |
+          python -c "import lightsim2grid"
+          python -c "from lightsim2grid import *"
+          python -c "from lightsim2grid.newtonpf import newtonpf"
+      
+      - name: Check LightSimBackend can be imported
+        run: |
+          python -m pip install grid2op
+          python -c "from lightsim2grid import LightSimBackend"
+          python -c "from lightsim2grid import LightSimBackend; import grid2op; env = grid2op.make('l2rpn_case14_sandbox', test=True, backend=LightSimBackend())"
+
+      - name: Upload wheel
+        uses: actions/upload-artifact@v3
+        with:
+          name: lightsim2grid-wheel-darwin-${{ matrix.python.name }}
+          path: dist/*.whl
+
+  macos_build_38_:
+    # build wheel for python 3.8 and above for macos
+    name: Build darwin ${{ matrix.python.name }} wheel
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        python:
+          - {
+            name: cp38,
+            version: '3.8',
+          }
+          - {
+            name: cp39,
+            version: '3.9',
+          }
+          - {
+            name: cp310,
+            version: '3.10',
+          }
+          - {
+            name: cp311,
+            version: '3.11',
+          }
+    env:
+      RUNNER_OS: macos-latest
+      PYTHON_VERSION: ${{ matrix.python.version }}
+
+    steps:
+
+      - name: Checkout sources
+        uses: actions/checkout@v3
+        with:
+          submodules: true
+
+      - name: Setup Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python.version }}
+
+      - name: Set Additional Envs
+        shell: bash
+        run: |
+          echo "PYTHON_SUBVERSION=$(echo $PYTHON_VERSION | cut -c 3-)" >> $GITHUB_ENV
+          echo "DEPLOY=$( [[ $GITHUB_EVENT_NAME == 'push' && $GITHUB_REF == 'refs/tags'* ]] && echo 'True' || echo 'False' )" >> $GITHUB_ENV
+
+      - name: Compile with cibuildwheel
+        uses: pypa/cibuildwheel@v2.15.0
+        env:
+          CIBW_BUILD: "cp3${{env.PYTHON_SUBVERSION}}-*"  # see https://github.com/cvxpy/cvxpy/blob/master/.github/workflows/build.yml
+          CIBW_ARCHS_LINUX: auto aarch64  # not used I believe
+          CIBW_ARCHS_MACOS: x86_64 arm64
+          CIBW_ENVIRONMENT: __O3_OPTIM=1
+          CIBW_BEFORE_BUILD: make clean && make  # and not CIBW_BEFORE_ALL !
+          CIBW_TEST_REQUIRES: grid2op pandapower
+          CIBW_TEST_SKIP: "*-macosx_arm64"  # to silence warning "While arm64 wheels can be built on x86_64, they cannot be tested."
+          CIBW_TEST_COMMAND: >
+            python -c "import lightsim2grid" && 
+            python -c "from lightsim2grid import *" &&
+            python -c "from lightsim2grid.newtonpf import newtonpf" && 
+            python -c "from lightsim2grid.solver import KLUSolver" && 
+            python -c "from lightsim2grid import LightSimBackend" &&
+            python -c "from lightsim2grid import LightSimBackend; import grid2op; env = grid2op.make('l2rpn_case14_sandbox', test=True, backend=LightSimBackend())"
+
+      - name: Upload wheel
+        uses: actions/upload-artifact@v3
+        with:
+          name: wheels-darwin-${{ matrix.python.name }}
+          path: ./wheelhouse/*.whl
 
   package:
     name: Package wheels
     runs-on: ubuntu-latest
-    needs: [manylinux_build, macos_windows_build]
+    needs: [manylinux_build, windows_build, macos_build_37, macos_build_38_]
 
     steps:
       - name: Download wheels
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           path: download
 
       - name: Upload wheels
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: lightsim2grid-wheels
           path: |
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 7ea2691..bda46b0 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -19,12 +19,16 @@ Change Log
 - easier building (get rid of the "make" part)
 - code NR with dense matrices
 
-[0.7.3] 2023-07-xx
+[0.7.3] 2023-08-24
 --------------------
 - [FIXED] a bug where, when you disconnect a load (or gen), the next action cannot be performed
   if it modifies the load (or gen), because you "cannot change the value of a disconnected load (or gen)"
+- [FIXED] read-the-docs template is not compatible with latest sphinx version (7.0.0)
+  see https://github.com/readthedocs/sphinx_rtd_theme/issues/1463
 - [IMPROVED] initialize the underlying "PandaPowerBackend" without numba
-- [IMPROVED] grid2op import to be more compliant with renaming of 
+- [IMPROVED] grid2op import to be more compliant with renaming of uppercased file names
+- [IMPROVED] decoupling of the PandapowerBackend class and the class "internally" used by LightSimBackend
+  when loading the grid. This caused some issue, *eg* https://github.com/rte-france/Grid2Op/issues/508
 
 [0.7.2] 2023-06-06
 --------------------
diff --git a/README.md b/README.md
index b94f0c2..57cb87d 100644
--- a/README.md
+++ b/README.md
@@ -85,6 +85,10 @@ Pypi packages are available for linux, windows and macos with python versions:
 - 3.8
 - 3.9
 - 3.10 (lightsim2grid >= 0.6.1)
+- 3.11 (lightsim2grid >= 0.7.1)
+
+**NB** on some version of MacOs (thanks Apple !), especially the one using M1 or M2 chip, lightsim2grid is only available
+on pypi starting from version 0.7.3
 
 ## Installation (from source, for more advanced user)
 
diff --git a/docs/conf.py b/docs/conf.py
index 62b0f0d..8b64a4f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -22,7 +22,7 @@
 author = 'Benjamin DONNOT'
 
 # The full version, including alpha/beta/rc tags
-release = "0.7.3"
+release = "0.7.4"
 version = '0.7'
 
 # -- General configuration ---------------------------------------------------
diff --git a/lightsim2grid/__init__.py b/lightsim2grid/__init__.py
index c99bdce..f7d6d89 100644
--- a/lightsim2grid/__init__.py
+++ b/lightsim2grid/__init__.py
@@ -9,7 +9,7 @@
 import faulthandler
 faulthandler.enable()
 
-__version__ = "0.7.3"
+__version__ = "0.7.4"
 
 __all__ = ["newtonpf", "SolverType", "ErrorType", "solver"]
 
diff --git a/lightsim2grid/_utils/__init__.py b/lightsim2grid/_utils/__init__.py
new file mode 100644
index 0000000..a1b43c0
--- /dev/null
+++ b/lightsim2grid/_utils/__init__.py
@@ -0,0 +1,11 @@
+# this class is defined to avoid circular references when using grid2op -> pandapower -> lightsim2grid -> grid2op
+# this module is lazily imported by the LightSimBackend and should not be used anywhere else, 
+# as the name states
+try:
+    from grid2op.Backend import PandaPowerBackend
+    class _DoNotUseAnywherePandaPowerBackend(PandaPowerBackend):
+        """used to duplicate the class attributes of PandaPowerBackend"""
+        pass
+except ImportError as exc_:
+    # grid2op is not installed, we do not use it.
+    pass
\ No newline at end of file
diff --git a/lightsim2grid/lightSimBackend.py b/lightsim2grid/lightSimBackend.py
index 3118613..7a0ce86 100644
--- a/lightsim2grid/lightSimBackend.py
+++ b/lightsim2grid/lightSimBackend.py
@@ -58,7 +58,7 @@ def __init__(self,
                              detailed_infos_for_cascading_failures=detailed_infos_for_cascading_failures)
 
         # lazy loading because it crashes...
-        from grid2op.Backend import PandaPowerBackend
+        from lightsim2grid._utils import _DoNotUseAnywherePandaPowerBackend
         from grid2op.Space import GridObjects  # lazy import
         self.__has_storage = hasattr(GridObjects, "n_storage")
         if not self.__has_storage:
@@ -84,13 +84,12 @@ def __init__(self,
 
         self.topo_vect = None
         self.shunt_topo_vect = None
-
         try:
-            self.init_pp_backend = PandaPowerBackend(with_numba=False)
+            self.init_pp_backend = _DoNotUseAnywherePandaPowerBackend(with_numba=False)
         except TypeError as exc_:
             # oldest version of grid2op do not support the kwargs "with_numba"
             # (before 1.9.1)
-            self.init_pp_backend = PandaPowerBackend()
+            self.init_pp_backend = _DoNotUseAnywherePandaPowerBackend()
         
         self.V = None
         self.max_it = max_iter
@@ -174,6 +173,22 @@ def __init__(self,
         # add the static gen to the list of controlable gen in grid2Op
         self._use_static_gen = use_static_gen  # TODO implement it
         
+        # storage data for this object (otherwise it's in the class)
+        self.n_storage = None
+        self.storage_to_subid = None
+        self.storage_pu_to_kv = None
+        self.name_storage = None
+        self.storage_to_sub_pos = None
+        self.storage_type = None
+        self.storage_Emin = None
+        self.storage_Emax = None
+        self.storage_max_p_prod = None
+        self.storage_max_p_absorb = None
+        self.storage_marginal_cost = None
+        self.storage_loss = None
+        self.storage_discharging_efficiency = None
+        self.storage_charging_efficiency = None
+
     def turnedoff_no_pv(self):
         self._turned_off_pv = False
         self._grid.turnedoff_no_pv()
@@ -439,7 +454,7 @@ def load_grid(self, path=None, filename=None):
             self.storage_loss = self.init_pp_backend.storage_loss
             self.storage_discharging_efficiency = self.init_pp_backend.storage_discharging_efficiency
             self.storage_charging_efficiency = self.init_pp_backend.storage_charging_efficiency
-
+        
         self.nb_bus_total = self.init_pp_backend._grid.bus.shape[0]
 
         self.thermal_limit_a = copy.deepcopy(self.init_pp_backend.thermal_limit_a)
@@ -477,7 +492,7 @@ def load_grid(self, path=None, filename=None):
                                              tmp.reshape(-1, 1)), axis=-1)
 
         self._big_topo_to_obj = [(None, None) for _ in range(self.dim_topo)]
-
+        
         self._compute_pos_big_topo()
 
         # set up the "lightsim grid" accordingly
@@ -591,8 +606,8 @@ def assert_grid_correct_after_powerflow(self):
         """
         # test the results gives the proper size
         super().assert_grid_correct_after_powerflow()
-        self.init_pp_backend.__class__ = self.init_pp_backend.init_grid(self)
-        self._backend_action_class = _BackendAction.init_grid(self)
+        self.init_pp_backend.__class__ = type(self.init_pp_backend).init_grid(type(self))
+        self._backend_action_class = _BackendAction.init_grid(type(self))
         self._init_action_to_set = self._backend_action_class()
         try:
             # feature added in grid2op 1.4 or 1.5
diff --git a/setup.py b/setup.py
index 0359640..2025432 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 from pybind11.setup_helpers import Pybind11Extension, build_ext
 
 
-__version__ = "0.7.3"
+__version__ = "0.7.4"
 KLU_SOLVER_AVAILABLE = False
 
 # Try to link against SuiteSparse (if available)
@@ -327,7 +327,7 @@
     "extras": {
         "docs": [
             "numpydoc>=0.9.2",
-            "sphinx>=2.4.4",
+            "sphinx>=2.4.4,<7",
             "sphinx-rtd-theme>=0.4.3",
             "sphinxcontrib-trio>=1.1.0",
             "autodocsumm>=0.1.13",