diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 67e57b26de..75006152f2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -29,6 +29,17 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         run: uv python install ${{ matrix.python-version }}
 
+      - name: Test runtime dependencies
+        run: |
+          uv run --no-dev -p python${{ matrix.python-version }} -- python -c '
+          from tmuxp import _internal, cli, workspace, exc, log, plugin, shell, types, util, __version__
+          from tmuxp._internal import config_reader, types
+          from tmuxp.workspace import builder, constants, finders, freezer, importers, loader, validation
+          from libtmux import __version__ as __libtmux_version__
+          print("tmuxp version:", __version__)
+          print("libtmux version:", __libtmux_version__)
+          '
+
       - name: Install dependencies
         run: uv sync --all-extras --dev
 
diff --git a/CHANGES b/CHANGES
index b0c485a056..fd4d555575 100644
--- a/CHANGES
+++ b/CHANGES
@@ -21,8 +21,13 @@ $ pipx install --suffix=@next 'tmuxp' --pip-args '\--pre' --force
 
 - _Future release notes will be placed here_
 
+### Bug fixes
+
+- Fix import type unavailable at runtime (#965)
+
 ### Development
 
+- CI: Check for runtime dependencies (#965)
 - Tests: Improve parametrized test suite (#964)
 
   Convert remaining `pytest.mark.parametrize()` tests to `NamedTuple` fixtures:
diff --git a/src/tmuxp/_internal/types.py b/src/tmuxp/_internal/types.py
index c66d88956c..a3521f5832 100644
--- a/src/tmuxp/_internal/types.py
+++ b/src/tmuxp/_internal/types.py
@@ -12,7 +12,16 @@
 
 from __future__ import annotations
 
-from typing_extensions import NotRequired, TypedDict
+import typing as t
+from typing import TypedDict
+
+if t.TYPE_CHECKING:
+    import sys
+
+    if sys.version_info >= (3, 11):
+        from typing import NotRequired
+    else:
+        from typing_extensions import NotRequired
 
 
 class PluginConfigSchema(TypedDict):