diff --git a/unicorn_fy/unicorn_fy.py b/unicorn_fy/unicorn_fy.py
index eb91c82..55a9753 100755
--- a/unicorn_fy/unicorn_fy.py
+++ b/unicorn_fy/unicorn_fy.py
@@ -37,6 +37,7 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
+from typing import Optional
 import cython
 import logging
 import platform
@@ -1265,7 +1266,7 @@ def get_latest_release_info():
         except Exception:
             return False
 
-    def get_latest_version(self):
+    def get_latest_version(self) -> Optional[str]:
         """
         Get the version of the latest available release (cache time 1 hour)