diff --git a/datasette/__init__.py b/datasette/__init__.py
index e69de29bb2..668a8c82a7 100644
--- a/datasette/__init__.py
+++ b/datasette/__init__.py
@@ -0,0 +1 @@
+from datasette.version import __version_info__, __version__  # noqa
diff --git a/datasette/app.py b/datasette/app.py
index 3a7854a07f..e1307ba74a 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -28,6 +28,7 @@
     sqlite_timelimit,
     validate_sql_select,
 )
+from .version import __version__
 
 app_root = Path(__file__).parent.parent
 
@@ -223,6 +224,7 @@ async def view_get(self, request, name, hash, **kwargs):
                 'url_json': path_with_ext(request, '.json'),
                 'url_jsono': path_with_ext(request, '.jsono'),
                 'metadata': self.ds.metadata,
+                'datasette_version': __version__,
             }}
             r = self.jinja.render(
                 template,
@@ -279,6 +281,7 @@ async def get(self, request, as_json):
                 request,
                 databases=databases,
                 metadata=self.ds.metadata,
+                datasette_version=__version__,
             )
 
 
diff --git a/datasette/templates/base.html b/datasette/templates/base.html
index d779f12ccb..1976b4acb6 100644
--- a/datasette/templates/base.html
+++ b/datasette/templates/base.html
@@ -12,7 +12,7 @@
 {% endblock %}
 
 <div class="ft">
-    Powered by <a href="https://github.com/simonw/datasette">Datasette</a>
+    Powered by <a href="https://github.com/simonw/datasette" title="Datasette v{{ datasette_version }}">Datasette</a>
     {% if query_ms %}&middot; Query took {{ query_ms|round(3) }}ms{% endif %}
     {% if metadata.license %}&middot; Data license:
         {% if metadata.license_url %}
diff --git a/datasette/version.py b/datasette/version.py
new file mode 100644
index 0000000000..81e1cef62d
--- /dev/null
+++ b/datasette/version.py
@@ -0,0 +1,2 @@
+__version_info__ = (0, 12)
+__version__ = '.'.join(map(str, __version_info__))
diff --git a/setup.py b/setup.py
index f05d558f3a..dbea708bb2 100644
--- a/setup.py
+++ b/setup.py
@@ -1,10 +1,11 @@
 from setuptools import setup, find_packages
+from datasette import __version__
 
 setup(
     name='datasette',
     description='An instant JSON API for your SQLite databases',
     author='Simon Willison',
-    version='0.11',
+    version=__version__,
     license='Apache License, Version 2.0',
     url='https://github.com/simonw/datasette',
     packages=find_packages(),