diff --git a/src/modelfuzz/cli.py b/src/modelfuzz/cli.py
index badb7ed..14506e6 100644
--- a/src/modelfuzz/cli.py
+++ b/src/modelfuzz/cli.py
@@ -273,8 +273,21 @@ def _truncate(text: str, limit: int = 140) -> str:
     return collapsed[: limit - 1] + "…"
 
 
+def _version_callback(value: bool) -> None:
+    if value:
+        typer.echo(__version__)
+        raise typer.Exit()
+
+
 @app.callback()
-def cli() -> None:
+def cli(
+    version: bool = typer.Option(
+        None, "--version", "-V",
+        callback=_version_callback,
+        is_eager=True,
+        help="Show the installed version and exit.",
+    ),
+) -> None:
     """Runtime guardrails for AI agents."""
 
 
diff --git a/tests/test_scan.py b/tests/test_scan.py
index c4dc727..c382d3b 100644
--- a/tests/test_scan.py
+++ b/tests/test_scan.py
@@ -89,6 +89,12 @@ def _run(monkeypatch, client, args=None):
         full_args += args
     return runner.invoke(cli.app, full_args)
 
+def test_version_flag_prints_version():
+    from modelfuzz import __version__
+    result = runner.invoke(cli.app, ["--version"])
+    assert result.exit_code == 0
+    assert __version__ in result.output
+
 
 def test_all_seeds_vulnerable_on_first_probe(monkeypatch):
     client = StubClient(probe_result=_tool_call_response())