diff --git a/setup.py b/setup.py
index 136c8f8..0e87ca6 100644
--- a/setup.py
+++ b/setup.py
@@ -15,7 +15,7 @@
 
 setup(
     name='citation_crawler',
-    version='2.5',
+    version='2.5.1',
     author='yindaheng98',
     author_email='yindaheng98@gmail.com',
     url='https://github.com/yindaheng98/citation-crawler',
@@ -32,6 +32,7 @@
     install_requires=[
         'dblp-crawler>=2.1',
         'python-dateutil>=2.8.2',
-        'neo4j>=5.15.0'
+        'neo4j>=5.15.0',
+        'typing-extensions'
     ],
 )