diff --git a/mcp/__init__.py b/mcp/__init__.py
index 5867cde4..6154f804 100644
--- a/mcp/__init__.py
+++ b/mcp/__init__.py
@@ -21,7 +21,11 @@ Configure in Claude Desktop, Windsurf, Cline, Continue, VS Code:
     }
 """
 
+# `semantica.__version__` is the authoritative package version — see
+# semantica/mcp_server/__init__.py for why it is used directly rather than
+# importlib.metadata.version("semantica").
+from semantica import __version__
+
 from .server import SemanticaMCPServer, main
 
-__all__ = ["SemanticaMCPServer", "main"]
-__version__ = "0.4.0"
+__all__ = ["SemanticaMCPServer", "main", "__version__"]
diff --git a/mcp/resources/registry.py b/mcp/resources/registry.py
index 052ee8c4..0f1d5ac4 100644
--- a/mcp/resources/registry.py
+++ b/mcp/resources/registry.py
@@ -10,6 +10,7 @@ from __future__ import annotations
 import json
 import logging
 
+from mcp import __version__
 from mcp.session import get_graph
 
 log = logging.getLogger("semantica.mcp.resources")
@@ -60,7 +61,7 @@ def _read_decisions_list(uri: str) -> dict:
 
 def _read_schema_info(uri: str) -> dict:
     info = {
-        "version": "0.4.0",
+        "version": __version__,
         "node_types": [
             "Entity", "decision", "Decision", "Event", "Concept",
             "Person", "Organisation", "Location",
diff --git a/mcp/server.py b/mcp/server.py
index 371343a5..3cd935be 100644
--- a/mcp/server.py
+++ b/mcp/server.py
@@ -17,6 +17,7 @@ import logging
 import sys
 from typing import Any
 
+from mcp import __version__
 from mcp.resources import RESOURCE_DEFINITIONS, handle_resource_read
 from mcp.tools import TOOL_DEFINITIONS
 
@@ -63,7 +64,7 @@ def _handle_initialize(req_id: Any, params: dict) -> dict:
         },
         "serverInfo": {
             "name": "semantica-mcp",
-            "version": "0.4.0",
+            "version": __version__,
         },
     })
 
diff --git a/tests/test_mcp_package_version.py b/tests/test_mcp_package_version.py
new file mode 100644
index 00000000..72e4aa55
--- /dev/null
+++ b/tests/test_mcp_package_version.py
@@ -0,0 +1,54 @@
+"""Regression tests for version reporting in the top-level `mcp` package
+(issue #863).
+
+Covers the same stale-version bug as `test_mcp_server_version.py` for the
+standalone `mcp/` server (run via `python -m mcp.server`), which is a
+separate implementation from `semantica.mcp_server` and was not covered
+by that fix. `semantica.__version__` is the authoritative package
+version (see semantica/mcp_server/__init__.py), so all three surfaces
+are asserted against it directly.
+"""
+
+import json
+import os
+import sys
+import unittest
+
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+
+import mcp
+import semantica
+from mcp.resources.registry import _read_schema_info
+from mcp.server import _handle_initialize
+
+_EXPECTED = semantica.__version__
+
+
+class TestMCPPackageVersion(unittest.TestCase):
+    def test_package_version_matches_authoritative_source(self):
+        self.assertEqual(mcp.__version__, _EXPECTED)
+
+    def test_package_version_is_not_stale_literal(self):
+        self.assertNotEqual(mcp.__version__, "0.4.0")
+
+    def test_initialize_server_info_version_matches_package(self):
+        response = _handle_initialize(1, {})
+        self.assertEqual(response["result"]["serverInfo"]["version"], _EXPECTED)
+
+    def test_initialize_server_info_version_is_not_stale_literal(self):
+        response = _handle_initialize(1, {})
+        self.assertNotEqual(response["result"]["serverInfo"]["version"], "0.4.0")
+
+    def test_schema_info_resource_version_matches_package(self):
+        resource = _read_schema_info("semantica://schema/info")
+        info = json.loads(resource["text"])
+        self.assertEqual(info["version"], _EXPECTED)
+
+    def test_schema_info_resource_version_is_not_stale_literal(self):
+        resource = _read_schema_info("semantica://schema/info")
+        info = json.loads(resource["text"])
+        self.assertNotEqual(info["version"], "0.4.0")
+
+
+if __name__ == "__main__":
+    unittest.main()