diff --git a/requirements.txt b/requirements.txt
index 0c49857..674e3bd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,3 +1,4 @@
+typing-extensions>=4
 aiohttp==3.8.1
 aiohttp-auth==0.1.1 
 aiohttp-route-decorator==0.1.4 
diff --git a/setup.py b/setup.py
index 07cb51a..a356451 100644
--- a/setup.py
+++ b/setup.py
@@ -38,6 +38,7 @@ setup(name='cbpi4',
       long_description=long_description,
 	    long_description_content_type='text/markdown',
       install_requires=[
+          "typing-extensions>=4",
           "aiohttp==3.8.1",
           "aiohttp-auth==0.1.1",
           "aiohttp-route-decorator==0.1.4",