diff --git a/.github/workflows/pytests-upstream.yml b/.github/workflows/pytests-upstream.yml
index aab2758e..bc3aded6 100644
--- a/.github/workflows/pytests-upstream.yml
+++ b/.github/workflows/pytests-upstream.yml
@@ -74,7 +74,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.10", "3.11", "3.12"]
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
 
     steps:
diff --git a/.github/workflows/pytests.yml b/.github/workflows/pytests.yml
index 6a325cc7..b78bd510 100644
--- a/.github/workflows/pytests.yml
+++ b/.github/workflows/pytests.yml
@@ -52,7 +52,7 @@ jobs:
       max-parallel: 12
       fail-fast: false
       matrix:
-        python-version: ["3.9", "3.10"]
+        python-version: ["3.10", "3.11"]
         os: ["ubuntu-latest", "windows-latest", "macos-latest"]
         experimental: [false]
 
diff --git a/ci/requirements/py3.11-all-pinned.yml b/ci/requirements/py3.11-all-pinned.yml
new file mode 100644
index 00000000..9dd38954
--- /dev/null
+++ b/ci/requirements/py3.11-all-pinned.yml
@@ -0,0 +1,61 @@
+name: argopy-tests
+channels:
+  - conda-forge
+dependencies:
+  - python = 3.11
+
+# CORE:
+  - aiohttp = 3.10.10
+  - decorator = 5.1.1
+  - erddapy = 2.2.3
+  - fsspec = 2024.9.0
+  - netCDF4 = 1.7.1
+  - packaging = 24.1
+  - requests = 2.32.3
+  - scipy = 1.14.1
+  - toolz = 1.0.0
+  - xarray = 2024.2.0  # < 2024.3 while https://github.com/pydata/xarray/issues/8909 is not solved
+
+# EXT.UTIL:
+  - boto3 = 1.35.23
+  - gsw = 3.6.19
+  - s3fs = 2024.9.0
+  - tqdm = 4.66.5
+  - zarr = 2.18.3
+
+# EXT.PERF:
+  - dask = 2024.9.1
+  - distributed = 2024.9.1
+  - h5netcdf = 1.4.0
+  - pyarrow = 17.0.0
+
+# EXT.PLOT:
+  - IPython = 8.28.0
+  - cartopy = 0.24.0
+  - ipykernel = 6.29.5
+  - ipywidgets = 8.1.5
+  - matplotlib = 3.9.2
+  - pyproj = 3.7.0
+  - seaborn = 0.13.2
+
+# DEV:
+  - aiofiles = 24.1.0
+  - black = 24.10.0
+  - bottleneck = 1.4.1
+  - cfgrib = 0.9.14.1
+  - cftime = 1.6.4
+  - codespell = 2.3.0
+  - flake8 = 7.1.1
+  - numpy = 1.26.4
+  - pandas = 2.2.3
+  - pip = 24.2
+  - pytest = 8.3.3
+  - pytest-cov = 5.0.0
+  - pytest-env = 1.1.5
+  - pytest-localftpserver
+  - setuptools = 75.1.0
+#  - sphinx = -
+
+# PIP:
+  - pip:
+      - pytest-reportlog == 0.4.0
\ No newline at end of file
diff --git a/ci/requirements/py3.11-core-pinned.yml b/ci/requirements/py3.11-core-pinned.yml
new file mode 100644
index 00000000..e5a7a1a4
--- /dev/null
+++ b/ci/requirements/py3.11-core-pinned.yml
@@ -0,0 +1,61 @@
+name: argopy-tests
+channels:
+  - conda-forge
+dependencies:
+  - python = 3.11
+
+# CORE:
+  - aiohttp = 3.10.10
+  - decorator = 5.1.1
+  - erddapy = 2.2.3
+  - fsspec = 2024.9.0
+  - netCDF4 = 1.7.1
+  - packaging = 24.1
+  - requests = 2.32.3
+  - scipy = 1.14.1
+  - toolz = 1.0.0
+  - xarray = 2024.2.0  # < 2024.3 while https://github.com/pydata/xarray/issues/8909 is not solved
+
+# EXT.UTIL:
+#  - boto3 = 1.35.23
+#  - gsw = 3.6.19
+#  - s3fs = 2024.9.0
+#  - tqdm = 4.66.5
+#  - zarr = 2.18.3
+
+# EXT.PERF:
+#  - dask = 2024.9.1
+#  - distributed = 2024.9.1
+#  - h5netcdf = 1.4.0
+#  - pyarrow = 17.0.0
+
+# EXT.PLOT:
+#  - IPython = 8.28.0
+#  - cartopy = 0.24.0
+#  - ipykernel = 6.29.5
+#  - ipywidgets = 8.1.5
+#  - matplotlib = 3.9.2
+#  - pyproj = 3.7.0
+#  - seaborn = 0.13.2
+
+# DEV:
+  - aiofiles = 24.1.0
+  - black = 24.10.0
+  - bottleneck = 1.4.1
+  - cfgrib = 0.9.14.1
+  - cftime = 1.6.4
+  - codespell = 2.3.0
+  - flake8 = 7.1.1
+  - numpy = 1.26.4
+  - pandas = 2.2.3
+  - pip = 24.2
+  - pytest = 8.3.3
+  - pytest-cov = 5.0.0
+  - pytest-env = 1.1.5
+  - pytest-localftpserver
+  - setuptools = 75.1.0
+#  - sphinx = -
+
+# PIP:
+  - pip:
+      - pytest-reportlog == 0.4.0
\ No newline at end of file