diff --git a/flapjacksearch/__init__.py b/flapjacksearch/__init__.py
index 4d12fcb..3d322ae 100644
--- a/flapjacksearch/__init__.py
+++ b/flapjacksearch/__init__.py
@@ -1,4 +1,27 @@
 # coding: utf-8
 
-# The version of the flapjacksearch package
-__version__ = "0.1.0b1"
\ No newline at end of file
+from importlib import import_module
+from pkgutil import iter_modules
+
+# The canonical version of the flapjacksearch package.
+__version__ = "1.0.0"
+
+
+def _sync_generated_subpackage_versions() -> None:
+    """Keep generated subpackage runtime versions aligned with the root package.
+
+    Generated clients stamp an OpenAPI spec version (for example ``4.36.0``)
+    into each top-level subpackage ``__init__``. At runtime, consumers expect
+    ``flapjacksearch.<subpackage>.__version__`` to match the distributable
+    package version exposed by ``flapjacksearch.__version__``.
+    """
+
+    for module_info in iter_modules(__path__):
+        if not module_info.ispkg:
+            continue
+        module = import_module(f"{__name__}.{module_info.name}")
+        if hasattr(module, "__version__"):
+            module.__version__ = __version__
+
+
+_sync_generated_subpackage_versions()
diff --git a/pyproject.toml b/pyproject.toml
index 0262341..380e8de 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "flapjack-search"
-version = "0.1.0b1"
+version = "1.0.0"
 description = "A fully-featured and blazing-fast Python API client to interact with Flapjack Search. Drop-in replacement for algoliasearch."
 authors = ["Flapjack <support@flapjack.com>"]
 license = "MIT"
diff --git a/tests/test_version_consistency.py b/tests/test_version_consistency.py
new file mode 100644
index 0000000..c655ead
--- /dev/null
+++ b/tests/test_version_consistency.py
@@ -0,0 +1,29 @@
+"""Version consistency checks for root and generated subpackages."""
+
+from importlib import import_module
+from pkgutil import iter_modules
+
+import flapjacksearch
+
+
+def _generated_subpackage_names():
+    """Discover current generated top-level subpackages from the package tree."""
+
+    return tuple(
+        sorted(
+            module_info.name
+            for module_info in iter_modules(flapjacksearch.__path__)
+            if module_info.ispkg
+        )
+    )
+
+
+def test_generated_subpackages_use_root_runtime_version():
+    subpackage_names = _generated_subpackage_names()
+
+    # Guard against a vacuous pass if package generation/output changes unexpectedly.
+    assert subpackage_names
+
+    for subpackage_name in subpackage_names:
+        module = import_module(f"flapjacksearch.{subpackage_name}")
+        assert module.__version__ == flapjacksearch.__version__