diff --git a/notecard/notecard.py b/notecard/notecard.py
index fabd7d1..88d2ab1 100644
--- a/notecard/notecard.py
+++ b/notecard/notecard.py
@@ -111,10 +111,11 @@ class Notecard:
 
     def __init__(self, debug=False):
         """Initialize the Notecard object."""
+        self.__version__ = self._fetch_version()
         self._user_agent_app = None
         self._user_agent_sent = False
         self._user_agent = {
-            'agent': 'note-python',
+            'agent': f'note-python {self.__version__}'.strip(),
             'os_name': sys.implementation.name,
             'os_platform': sys.platform,
             'os_version': sys.version
@@ -129,6 +130,22 @@ def __init__(self, debug=False):
         self._card_supports_crc = False
         self._reset_required = True
 
+    def _fetch_version(self):
+        """Fetch the version of the note-python library."""
+        try:
+            # Check development version
+            import tomllib
+            with open('pyproject.toml', 'rb') as f:
+                data = tomllib.load(f)
+            return data['project']['version']
+        except Exception:
+            # Check installed version
+            try:
+                import importlib.metadata
+                return importlib.metadata.version('note-python')
+            except Exception:
+                return ''
+
     def _crc_add(self, req_string, seq_number):
         """Add a CRC field to the request.
 
diff --git a/test/test_notecard.py b/test/test_notecard.py
index 08c1d06..00c2db8 100644
--- a/test/test_notecard.py
+++ b/test/test_notecard.py
@@ -442,12 +442,27 @@ def test_get_user_agent(self):
         card = notecard.Notecard()
         userAgent = card.GetUserAgent()
 
-        assert userAgent['agent'] == 'note-python'
+        expected_agent = f'note-python {card.__version__}'.strip()
+        assert userAgent['agent'] == expected_agent
         assert userAgent['os_name'] is not None
         assert userAgent['os_platform'] is not None
         assert userAgent['os_version'] is not None
         assert userAgent['os_family'] is not None
 
+    def test_get_user_agent_with_custom_version(self):
+        with patch.object(notecard.Notecard, '_fetch_version', return_value='1.1.1'):
+            card = notecard.Notecard()
+            userAgent = card.GetUserAgent()
+
+            assert userAgent['agent'] == 'note-python 1.1.1'
+
+    def test_get_user_agent_with_missing_version(self):
+        with patch.object(notecard.Notecard, '_fetch_version', return_value=''):
+            card = notecard.Notecard()
+            userAgent = card.GetUserAgent()
+
+            assert userAgent['agent'] == 'note-python'
+
     # SetAppUserAgent tests.
     def set_user_agent_info(self, info=None):
         card = notecard.Notecard()