diff --git a/.github/workflows/package-validation-reusable.yml b/.github/workflows/package-validation-reusable.yml
index 175cc20cc..14f05af90 100644
--- a/.github/workflows/package-validation-reusable.yml
+++ b/.github/workflows/package-validation-reusable.yml
@@ -8,6 +8,8 @@ permissions:
 
 env:
   MAIN_PYTHON_VERSION: 3.12
+  # Lowest interpreter allowed by requires-python in pyproject.toml.
+  MIN_PYTHON_VERSION: "3.10"
 
 jobs:
   build-package:
@@ -69,3 +71,47 @@ jobs:
         run: |
           .venv/bin/codecarbon --help
           .venv/bin/python -c "from codecarbon import EmissionsTracker; print('Package import successful')"
+
+  # Proves `pip install codecarbon` works with only the declared runtime
+  # dependencies (no dev group, no extras), on the oldest supported
+  # interpreter. The job above installs the dev group first, so it cannot
+  # catch a runtime dependency that is declared nowhere but the lockfile.
+  bare-install-smoke:
+    runs-on: ubuntu-24.04
+    needs: [build-package]
+    steps:
+      - name: Install uv
+        uses: astral-sh/setup-uv@cec208311dfd045dd5311c1add060b2062131d57 # v8.0.0
+        with:
+          version: "latest"
+      - name: Download built package
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+        with:
+          name: pypi_dist
+          path: dist
+      - name: Install wheel into a bare virtualenv
+        run: |
+          uv venv --python ${{ env.MIN_PYTHON_VERSION }} .venv
+          uv pip install --python .venv/bin/python dist/*.whl
+      - name: Smoke test
+        env:
+          CODECARBON_ALLOW_MULTIPLE_RUNS: "True"
+        run: |
+          .venv/bin/python -c "import codecarbon; print(codecarbon.__version__)"
+          .venv/bin/codecarbon --help
+          .venv/bin/python -c "
+          import time
+          from codecarbon import OfflineEmissionsTracker
+          tracker = OfflineEmissionsTracker(country_iso_code='FRA', measure_power_secs=1)
+          tracker.start()
+          time.sleep(2)
+          emissions = tracker.stop()
+          print('emissions:', emissions)
+          # stop() returns None on every internal give-up path (tracker never
+          # started, another instance holding the lock, engine init failed), so
+          # a bare call would print None and still exit 0. Assert the shape, not
+          # the magnitude: a runner with no RAPL falls back to constant CPU
+          # power and 0.0 over 2s is a legitimate result.
+          assert isinstance(emissions, float), f'tracker.stop() returned {emissions!r}'
+          assert emissions >= 0.0, emissions
+          "
diff --git a/.github/workflows/package.yml b/.github/workflows/package.yml
index 8167dc201..354cdd562 100644
--- a/.github/workflows/package.yml
+++ b/.github/workflows/package.yml
@@ -6,11 +6,15 @@ on:
     paths:
       - "codecarbon/**"
       - "pyproject.toml"
+      - ".github/workflows/package.yml"
+      - ".github/workflows/package-validation-reusable.yml"
     branches: [master]
   push:
     paths:
       - "codecarbon/**"
       - "pyproject.toml"
+      - ".github/workflows/package.yml"
+      - ".github/workflows/package-validation-reusable.yml"
     branches: [master]
 jobs:
   validate-package:
diff --git a/.github/workflows/test-package.yml b/.github/workflows/test-package.yml
index 0d3717e86..9d793ac71 100644
--- a/.github/workflows/test-package.yml
+++ b/.github/workflows/test-package.yml
@@ -20,8 +20,11 @@ jobs:
       CODECARBON_API_KEY: ${{ secrets.CODECARBON_API_TOKEN }}
       CODECARBON_EXPERIMENT_ID: ${{ secrets.CODECARBON_EXPERIMENT_ID_TEST_PACKAGE }}
     strategy:
+        fail-fast: false
         matrix:
-          python-version: ["3.12", "3.13", "3.14"]
+          # Must cover every version allowed by requires-python / classifiers
+          # in pyproject.toml.
+          python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
     - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
     - name: Install uv
diff --git a/tests/test_gpu_amd.py b/tests/test_gpu_amd.py
index e066ee657..2d5fcdd38 100644
--- a/tests/test_gpu_amd.py
+++ b/tests/test_gpu_amd.py
@@ -429,6 +429,15 @@ def _patched_import(name, *args, **kwargs):
             sys.modules.pop("amdsmi", None)
             sys.modules.pop("codecarbon.core.gpu_amd", None)
             sys.modules.update(saved)
+            # importlib also rebinds the submodule attribute on the parent
+            # package, and restoring sys.modules alone does not undo that.
+            # On Python < 3.12 mock.patch resolves "codecarbon.core.gpu_amd.x"
+            # through that attribute, so a stale binding would send later
+            # patches to the throwaway module. Put the real one back.
+            if "codecarbon.core.gpu_amd" in saved:
+                import codecarbon.core
+
+                codecarbon.core.gpu_amd = saved["codecarbon.core.gpu_amd"]
 
     def test_oserror_sets_amdsmi_unavailable(self):
         """OSError during amdsmi import (e.g. missing libamd_smi.so) must disable AMD GPU support."""