diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3b286e5ae..611c91aea 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,3 +50,27 @@ jobs:
 
       - name: Run tests
         run: ./scripts/test
+
+  # 2.1.2 declared requires-python >= 3.9 and could not be imported on 3.9, and
+  # the test job above only ever runs .python-version (3.12). Install the package
+  # the way a user does, on the floor and on the newest Python it classifies.
+  import:
+    name: import (Python ${{ matrix.python-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.9', '3.13']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install the package
+        run: python -m pip install . pytest pytest-asyncio respx
+
+      - name: Every module imports
+        run: python -m pytest tests/test_imports.py -q
diff --git a/pkg/hanzoai/grpo/enhanced_api_model_adapter.py b/pkg/hanzoai/grpo/enhanced_api_model_adapter.py
index 9be234f6f..66c759d93 100644
--- a/pkg/hanzoai/grpo/enhanced_api_model_adapter.py
+++ b/pkg/hanzoai/grpo/enhanced_api_model_adapter.py
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import annotations
+
 import os
 import time
 import asyncio
diff --git a/pkg/hanzoai/grpo/enhanced_semantic_extractor.py b/pkg/hanzoai/grpo/enhanced_semantic_extractor.py
index 872dcc28c..e29ed5250 100644
--- a/pkg/hanzoai/grpo/enhanced_semantic_extractor.py
+++ b/pkg/hanzoai/grpo/enhanced_semantic_extractor.py
@@ -15,6 +15,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+from __future__ import annotations
+
 import os
 import copy
 import json
diff --git a/tests/test_imports.py b/tests/test_imports.py
new file mode 100644
index 000000000..c3bd7c517
--- /dev/null
+++ b/tests/test_imports.py
@@ -0,0 +1,45 @@
+"""Every module in ``hanzoai`` imports on every Python that requires-python admits.
+
+2.1.2 declared ``requires-python >= 3.9`` and could not be imported on 3.9 at all:
+``grpo/enhanced_api_model_adapter.py`` annotated a return as ``str | Tuple[...]``,
+which 3.9 evaluates at class-body time and rejects with ``TypeError``, and
+``hanzoai/__init__.py`` imports ``grpo`` eagerly. The test job runs only
+``.python-version`` (3.12), where that line is valid, so nothing could see it.
+
+The module list comes from the filesystem rather than from importing the package,
+so a package that fails to import shows up as a failing module instead of an
+empty list.
+"""
+
+from __future__ import annotations
+
+import importlib
+import importlib.util
+from pathlib import Path
+
+import pytest
+
+
+def _module_names() -> list[str]:
+    spec = importlib.util.find_spec("hanzoai")
+    assert spec is not None and spec.submodule_search_locations
+    root = Path(next(iter(spec.submodule_search_locations)))
+    names = []
+    for path in sorted(root.rglob("*.py")):
+        parts = path.relative_to(root.parent).with_suffix("").parts
+        if parts[-1] == "__init__":
+            parts = parts[:-1]
+        names.append(".".join(parts))
+    return names
+
+
+@pytest.mark.parametrize("name", _module_names())
+def test_module_imports(name: str) -> None:
+    try:
+        importlib.import_module(name)
+    except ModuleNotFoundError as exc:
+        # An optional dependency that is not installed says nothing about this
+        # interpreter; a missing hanzoai module does.
+        if exc.name and exc.name.split(".")[0] != "hanzoai":
+            pytest.skip(f"optional dependency {exc.name} is not installed")
+        raise